Clean up expired chrome://flags for offline capability check

This CL reverts https://crrev.com/c/2494288 and
https://crrev.com/c/2517278 to remove the flag that was expired on M93
(chrome://flags#check-offline-capability).

Bug: 965802
Change-Id: I4ea3b0da02b81bdebb6bf1b6fc68a49f80b810fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4202272
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Auto-Submit: Asami Doi <asamidoi@chromium.org>
Commit-Queue: Asami Doi <asamidoi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1098456}

chrome/browser/about_flags.cc

@@ -2613,18 +2613,6 @@ const FeatureEntry::FeatureVariation
 };
 #endif  // BUILDFLAG(IS_ANDROID)
 
-const FeatureEntry::FeatureParam kCheckOfflineCapabilityWarnOnly[] = {
-    {"check_mode", "warn_only"}};
-const FeatureEntry::FeatureParam kCheckOfflineCapabilityEnforce[] = {
-    {"check_mode", "enforce"}};
-
-const FeatureEntry::FeatureVariation kCheckOfflineCapabilityVariations[] = {
-    {"Warn-only", kCheckOfflineCapabilityWarnOnly,
-     std::size(kCheckOfflineCapabilityWarnOnly), nullptr},
-    {"Enforce", kCheckOfflineCapabilityEnforce,
-     std::size(kCheckOfflineCapabilityEnforce), nullptr},
-};
-
 #if BUILDFLAG(IS_CHROMEOS_ASH)
 const FeatureEntry::FeatureParam kProductivityLauncher_WithoutContinue[] = {
     {"enable_continue", "false"}};
@@ -7601,12 +7589,6 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kBlockInsecureDownloadsDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kBlockInsecureDownloads)},
 
-    {"check-offline-capability", flag_descriptions::kCheckOfflineCapabilityName,
-     flag_descriptions::kCheckOfflineCapabilityDescription, kOsAll,
-     FEATURE_WITH_PARAMS_VALUE_TYPE(blink::features::kCheckOfflineCapability,
-                                    kCheckOfflineCapabilityVariations,
-                                    "CheckOfflineCapability")},
-
     {"deferred-font-shaping", flag_descriptions::kDeferredFontShapingName,
      flag_descriptions::kDeferredFontShapingDescription, kOsAll,
      FEATURE_VALUE_TYPE(blink::features::kDeferredShaping)},

chrome/browser/flag-metadata.json

@@ -952,11 +952,6 @@
     "owners": ["hchao", "mattm", "davidben", "chrome-trusty-transport-core@google.com"],
     "expiry_milestone": 115
   },
-  {
-    "name": "check-offline-capability",
-    "owners": [ "asamidoi", "//content/browser/service_worker/OWNERS" ],
-    "expiry_milestone": 93
-  },
   {
     "name": "chip-location-bar-icon-override",
     "owners": [

chrome/browser/flag_descriptions.cc

@@ -670,11 +670,6 @@ const char kServiceWorkerBypassFetchHandlerForMainResourceDescription[] =
     "and handles subresources. If the main resource could be handled in the "
     "fetch handler, the feature may affect the page load.";
 
-const char kCheckOfflineCapabilityName[] = "Check offline capability for PWAs";
-const char kCheckOfflineCapabilityDescription[] =
-    "Use advanced offline capability check to decide whether the browser "
-    "displays install prompts for PWAs.";
-
 const char kChromeLabsName[] = "Chrome Labs";
 const char kChromeLabsDescription[] =
     "Access Chrome Labs through the toolbar menu to see featured user-facing "

chrome/browser/flag_descriptions.h

@@ -370,9 +370,6 @@ extern const char kServiceWorkerBypassFetchHandlerForMainResourceDescription[];
 extern const char kCanvasOopRasterizationName[];
 extern const char kCanvasOopRasterizationDescription[];
 
-extern const char kCheckOfflineCapabilityName[];
-extern const char kCheckOfflineCapabilityDescription[];
-
 extern const char kChromeLabsName[];
 extern const char kChromeLabsDescription[];