Remove OfflineIndicator feature flag

Also remove dead controller code associated.

BUG=1385901

Change-Id: I795506ddabf697037b88cc927b3996556759615a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4114155
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/main@{#1085125}

chrome/android/chrome_java_resources.gni

@@ -399,7 +399,6 @@ chrome_java_resources = [
   "java/res/drawable/ic_new_tab_button.xml",
   "java/res/drawable/ic_new_window.xml",
   "java/res/drawable/ic_offer_tag.xml",
-  "java/res/drawable/ic_offline_pin_white.xml",
   "java/res/drawable/ic_open_in_browser.xml",
   "java/res/drawable/ic_person_add_40dp.xml",
   "java/res/drawable/ic_reading_list_folder_24dp.xml",

chrome/android/chrome_java_sources.gni

@@ -832,12 +832,9 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/offlinepages/TriggerConditions.java",
   "java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadBridge.java",
   "java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineDetector.java",
-  "java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorController.java",
   "java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorControllerV2.java",
   "java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorInProductHelpController.java",
   "java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorMetricsDelegate.java",
-  "java/src/org/chromium/chrome/browser/offlinepages/indicator/TopSnackbarManager.java",
-  "java/src/org/chromium/chrome/browser/offlinepages/indicator/TopSnackbarView.java",
   "java/src/org/chromium/chrome/browser/offlinepages/measurements/OfflineMeasurementsBackgroundTask.java",
   "java/src/org/chromium/chrome/browser/offlinepages/prefetch/PrefetchBackgroundTask.java",
   "java/src/org/chromium/chrome/browser/offlinepages/prefetch/PrefetchBackgroundTaskScheduler.java",

chrome/android/chrome_test_java_sources.gni

@@ -274,7 +274,6 @@ chrome_test_java_sources = [
   "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtilsTest.java",
   "javatests/src/org/chromium/chrome/browser/offlinepages/RecentTabsTest.java",
   "javatests/src/org/chromium/chrome/browser/offlinepages/RequestCoordinatorBridgeTest.java",
-  "javatests/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorControllerTest.java",
   "javatests/src/org/chromium/chrome/browser/offlinepages/prefetch/PrefetchBackgroundTaskTest.java",
   "javatests/src/org/chromium/chrome/browser/offlinepages/prefetch/PrefetchConfigurationTest.java",
   "javatests/src/org/chromium/chrome/browser/offlinepages/prefetch/TestOfflinePageService.java",

chrome/android/java/src/org/chromium/chrome/browser/app/ChromeActivity.java

@@ -138,7 +138,6 @@
 import org.chromium.chrome.browser.night_mode.WebContentsDarkModeMessageController;
 import org.chromium.chrome.browser.ntp.NewTabPageUma;
 import org.chromium.chrome.browser.offlinepages.OfflinePageUtils;
-import org.chromium.chrome.browser.offlinepages.indicator.OfflineIndicatorController;
 import org.chromium.chrome.browser.omaha.UpdateMenuItemHelper;
 import org.chromium.chrome.browser.page_info.ChromePageInfo;
 import org.chromium.chrome.browser.page_info.ChromePageInfoHighlight;
@@ -979,7 +978,6 @@ public void onStartWithNative() {
         super.onStartWithNative();
         ChromeActivitySessionTracker.getInstance().onStartWithNative();
         ChromeCachedFlags.getInstance().cacheNativeFlags();
-        OfflineIndicatorController.initialize();
 
         // postDeferredStartupIfNeeded() is called in TabModelSelectorTabObsever#onLoadStopped(),
         // #onPageLoadFinished() and #onCrash(). If we are not actively loading a tab (e.g.