[iOS] Remove kClearSyncedData feature flag.

The ClearSyncedData feature has been enabled by default.

Bug: 1005509
Change-Id: I799683d3cd1e9194d66751c1d4ac52f578949f04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260732Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781371}

ios/chrome/browser/flags/about_flags.mm

@@ -540,9 +540,6 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"contained-browser-bvc", flag_descriptions::kContainedBVCName,
      flag_descriptions::kContainedBVCDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kContainedBVC)},
-    {"clear-synced-data", flag_descriptions::kClearSyncedDataName,
-     flag_descriptions::kClearSyncedDataDescription, flags_ui::kOsIos,
-     FEATURE_VALUE_TYPE(kClearSyncedData)},
     {"ssl-committed-interstitials",
      flag_descriptions::kSSLCommittedInterstitialsName,
      flag_descriptions::kSSLCommittedInterstitialsDescription, flags_ui::kOsIos,

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -137,12 +137,6 @@ const char kBreakpadNoDelayInitialUploadDescription[] =
     "disabled, initial upload is delayed until deferred initialization. This "
     "does not affect recovery mode.";
 
-const char kClearSyncedDataName[] = "Clear Synced Data on Sign Out";
-const char kClearSyncedDataDescription[] =
-    "When enabled users signed in with a non-managed account will be "
-    "presented with the option to clear synced data from the local "
-    "device when signing out.";
-
 extern const char kChangeTabSwitcherPositionName[] =
     "Change tab switcher button position";
 extern const char kChangeTabSwitcherPositionDescription[] =

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -106,11 +106,6 @@ extern const char kLogBreadcrumbsDescription[];
 extern const char kBreakpadNoDelayInitialUploadName[];
 extern const char kBreakpadNoDelayInitialUploadDescription[];
 
-// Title and description for the flag to control if Chrome should wipe synced
-// data from a local device on sign-out from a non-managed account.
-extern const char kClearSyncedDataName[];
-extern const char kClearSyncedDataDescription[];
-
 // Title and description for the flag that controls the tab switcher position.
 extern const char kChangeTabSwitcherPositionName[];
 extern const char kChangeTabSwitcherPositionDescription[];

ios/chrome/browser/ui/ui_feature_flags.cc

@@ -34,9 +34,6 @@ const base::Feature kContainedBVC{"ContainedBVC",
 const base::Feature kTestFeature{"TestFeature",
                                  base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kClearSyncedData{"ClearSyncedData",
-                                     base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kFirstResponderSendAction{
     "FirstResponderSendAction", base::FEATURE_DISABLED_BY_DEFAULT};
 

ios/chrome/browser/ui/ui_feature_flags.h

@@ -38,10 +38,6 @@ extern const base::Feature kContainedBVC;
 // features in tests works.
 extern const base::Feature kTestFeature;
 
-// Feature flag to display a new option that wipes synced data on a local
-// device when signing out from a non-managed account.
-extern const base::Feature kClearSyncedData;
-
 // Verify if the crash in https://crbug.com/816427 is fixed on iOS 12.
 extern const base::Feature kFirstResponderSendAction;