[iOS] Remove signin_sync screen

This CL remove all the code and resources used by the signin_sync FRE
view as they are no longer used.

Bug: 1407658

Change-Id: I6855eb1282cd1318de777865436faa5b4d1d736a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4184224
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Auto-Submit: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1096751}

ios/chrome/app/strings/ios_strings.grd

@@ -1026,9 +1026,6 @@ See your search engine’s instructions for deleting your search history, if app
       <message name="IDS_IOS_FIRST_RUN_SIGNIN_SIGN_IN_ACTION" desc="In Title Case: Button on the very first screen of Chrome for users to sign in when there is no Google Account on the device. [iOS only]">
         Sign In…
       </message>
-      <message name="IDS_IOS_FIRST_RUN_SYNC_SCREEN_CONTENT_WITH_LINK_TO_SETTINGS" desc="Content string on the sync screen presented to the user on First Run [iOS only]">
-        You can always choose what to sync in <ph name="BEGIN_LINK">BEGIN_LINK</ph>settings<ph name="END_LINK">END_LINK</ph>. Google may use your history to personalize Search and other Google services.
-      </message>
       <message name="IDS_IOS_FIRST_RUN_SYNC_SCREEN_PRIMARY_ACTION" desc="The primary action string on the sync screen presented to the user on First Run [iOS only]">
         Turn on Sync
       </message>
@@ -2429,9 +2426,6 @@ While in Incognito, sites can't use cookies to see your browsing activity across
       <message name="IDS_IOS_ENTERPRISE_MANAGED_INFO" desc="Text displayed to inform the user that the browser is managed by one or more Enterprise policies. [iOS only]">
         Managed by your organization. Some features may be unavailable. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Learn more<ph name="END_LINK">END_LINK</ph>
       </message>
-      <message name="IDS_IOS_ENTERPRISE_MANAGED_SIGNIN_DETAILS" desc="Text displayed to inform the user that their Sign In/Sync is managed by their administrator. [iOS only]">
-          Your browser is managed. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Details<ph name="END_LINK">END_LINK</ph>
-      </message>
       <message name="IDS_IOS_ENTERPRISE_MANAGED_SIGNIN_LEARN_MORE" desc="Text displayed to inform the user that their Sign In/Sync is managed by their administrator. [iOS only]">
           Your browser is managed. <ph name="BEGIN_LINK">BEGIN_LINK</ph>Learn More<ph name="END_LINK">END_LINK</ph>
       </message>

ios/chrome/browser/first_run/first_run_metrics.h

@@ -84,14 +84,13 @@ enum FirstRunStage {
   // The first run experience has completed.
   kComplete = 1,
   // Sync screen is shown.
-  kSyncScreenStart = 2,
+  // kSyncScreenStart_DEPRECATED = 2,
   // Sync screen is closed with sync.
-  kSyncScreenCompletionWithSync = 3,
+  // kSyncScreenCompletionWithSync_DEPRECATED = 3,
   // Sync screen is closed without sync.
-  kSyncScreenCompletionWithoutSync = 4,
+  // kSyncScreenCompletionWithoutSync_DEPRECATED = 4,
   // Sync screen is closed when user taps on advance sync settings button.
-  // Deprecated. This is not used anymore.
-  kSyncScreenCompletionWithSyncSettings = 5,
+  // kSyncScreenCompletionWithSyncSettings_DEPRECATED = 5,
   // SignIn screen is shown.
   kSignInScreenStart = 6,
   // SignIn screen is closed with sign in.
@@ -145,12 +144,6 @@ enum FirstRunScreenType {
   // detected, but with no footer shown at the bottom. Displayed when MICe is
   // enabled with the welcome screen (3-steps MICe FRE).
   kSignInScreenWithoutFooterOrIdentityPicker,
-  // The screen that asks the user to turn on sync while no account picker is
-  // present. Displayed when MICe is enabled or when no account is detected.
-  kSyncScreenWithoutIdentityPicker,
-  // The screen that asks the user to turn on sync while showing an account
-  // picker. Displayed when MICe is disabled and an account is detected.
-  kSyncScreenWithIdentityPicker,
   // Welcome screen without UMA checkbox. Displayed when MICe is enabled.
   kWelcomeScreenWithoutUMACheckbox,
   // Welcome screen with UMA checkbox. Displayed when MICe is disabled.

ios/chrome/browser/ui/authentication/enterprise/enterprise_utils.h

@@ -9,29 +9,11 @@
 
 #include "ios/chrome/browser/sync/sync_setup_service.h"
 
-class AuthenticationService;
 class PrefService;
 namespace syncer {
 class SyncService;
 }
 
-// List of Enterprise restriction options.
-typedef NS_OPTIONS(NSUInteger, EnterpriseSignInRestrictions) {
-  // No enterprise restriction.
-  kNoEnterpriseRestriction = 0,
-  // Sign-in is forced.
-  kEnterpriseForceSignIn = 1 << 0,
-  // Sign-in is disabled, please consider using
-  // AuthenticationService::GetServiceStatus() to get all disable reasons.
-  kEnterpriseSignInDisabled = 1 << 1,
-  // Account restrictions are set.
-  kEnterpriseRestrictAccounts = 1 << 2,
-  // Sync is disabled.
-  kEnterpriseSyncDisabled = 1 << 3,
-  // If any data type is managed by policies (i.e. is not syncable).
-  kEnterpriseSyncTypesListDisabled = 1 << 4,
-};
-
 // Returns YES if some account restrictions are set.
 bool IsRestrictAccountsToPatternsEnabled();
 
@@ -42,12 +24,6 @@ bool IsManagedSyncDataType(PrefService* pref_service,
 // Returns true if any data type is managed by policies (i.e. is not syncable).
 bool HasManagedSyncDataType(PrefService* pref_service);
 
-// Returns current EnterpriseSignInRestrictions.
-EnterpriseSignInRestrictions GetEnterpriseSignInRestrictions(
-    AuthenticationService* authentication_service,
-    PrefService* pref_service,
-    syncer::SyncService* sync_service);
-
 // true if sync is disabled.
 bool IsSyncDisabledByPolicy(syncer::SyncService* sync_service);
 

ios/chrome/browser/ui/authentication/enterprise/enterprise_utils.mm

@@ -13,7 +13,6 @@
 #import "ios/chrome/browser/application_context/application_context.h"
 #import "ios/chrome/browser/policy/policy_util.h"
 #import "ios/chrome/browser/prefs/pref_names.h"
-#import "ios/chrome/browser/signin/authentication_service.h"
 #import "ios/chrome/browser/sync/sync_service_factory.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -60,32 +59,6 @@ bool HasManagedSyncDataType(PrefService* pref_service) {
   return false;
 }
 
-EnterpriseSignInRestrictions GetEnterpriseSignInRestrictions(
-    AuthenticationService* authentication_service,
-    PrefService* pref_service,
-    syncer::SyncService* sync_service) {
-  EnterpriseSignInRestrictions restrictions = kNoEnterpriseRestriction;
-  switch (authentication_service->GetServiceStatus()) {
-    case AuthenticationService::ServiceStatus::SigninForcedByPolicy:
-      restrictions |= kEnterpriseForceSignIn;
-      break;
-    case AuthenticationService::ServiceStatus::SigninDisabledByPolicy:
-      restrictions |= kEnterpriseSignInDisabled;
-      break;
-    case AuthenticationService::ServiceStatus::SigninAllowed:
-    case AuthenticationService::ServiceStatus::SigninDisabledByUser:
-    case AuthenticationService::ServiceStatus::SigninDisabledByInternal:
-      break;
-  }
-  if (IsRestrictAccountsToPatternsEnabled())
-    restrictions |= kEnterpriseRestrictAccounts;
-  if (IsSyncDisabledByPolicy(sync_service))
-    restrictions |= kEnterpriseSyncDisabled;
-  if (HasManagedSyncDataType(pref_service))
-    restrictions |= kEnterpriseSyncTypesListDisabled;
-  return restrictions;
-}
-
 bool IsSyncDisabledByPolicy(syncer::SyncService* sync_service) {
   return sync_service->GetDisableReasons().Has(
       syncer::SyncService::DISABLE_REASON_ENTERPRISE_POLICY);

ios/chrome/browser/ui/authentication/signin/forced_signin/forced_signin_coordinator.mm

@@ -115,7 +115,6 @@ - (InterruptibleChromeCoordinator*)createChildCoordinatorWithScreenType:
                                    browser:self.browser
                             showFREConsent:NO
                                   delegate:self];
-    case kSignInAndSync_DEPRECATED:
     case kTangibleSync:
     case kWelcomeAndConsent_DEPRECATED:
     case kDefaultBrowserPromo: