[iOS] Remove kNewSigninArchitecture feature flag.

The NewSigninArchitecture feature has been enabled by default.

Bug: 971989
Change-Id: I7289a97541d239edbfc1b3b65aea04abe9c46edd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260553Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781323}

ios/chrome/browser/flags/about_flags.mm

@@ -570,9 +570,6 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"safe-browsing-available", flag_descriptions::kSafeBrowsingAvailableName,
      flag_descriptions::kSafeBrowsingAvailableDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(safe_browsing::kSafeBrowsingAvailableOnIOS)},
-    {"new-signin-architecture", flag_descriptions::kNewSigninArchitectureName,
-     flag_descriptions::kNewSigninArchitectureDescription, flags_ui::kOsIos,
-     FEATURE_VALUE_TYPE(kNewSigninArchitecture)},
     {"qr-code-generation", flag_descriptions::kQRCodeGenerationName,
      flag_descriptions::kQRCodeGenerationDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kQRCodeGeneration)},

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -324,11 +324,6 @@ const char kMobileGoogleSRPDescription[] =
     "Request the Mobile version of Google SRP by default when the desktop mode "
     "is requested by default.";
 
-const char kNewSigninArchitectureName[] = "Enable new sign-in architecture";
-const char kNewSigninArchitectureDescription[] =
-    "When enabled uses the new sign-in architecture based on core Bling "
-    "design paradigms.";
-
 const char kOmniboxPreserveDefaultMatchAgainstAsyncUpdateName[] =
     "Omnibox Preserve Default Match Against Async Update";
 const char kOmniboxPreserveDefaultMatchAgainstAsyncUpdateDescription[] =

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -283,10 +283,6 @@ extern const char kMarkHttpAsDescription[];
 extern const char kMobileGoogleSRPName[];
 extern const char kMobileGoogleSRPDescription[];
 
-// Title and description for the flag to enable the new sign-in architecture.
-extern const char kNewSigninArchitectureName[];
-extern const char kNewSigninArchitectureDescription[];
-
 // Title and description for the flag to preserve the default match when an
 // async match updates.
 extern const char kOmniboxPreserveDefaultMatchAgainstAsyncUpdateName[];

ios/chrome/browser/ui/ui_feature_flags.cc

@@ -40,9 +40,6 @@ const base::Feature kClearSyncedData{"ClearSyncedData",
 const base::Feature kFirstResponderSendAction{
     "FirstResponderSendAction", base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kNewSigninArchitecture{"NewSigninArchitecture",
-                                           base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kQRCodeGeneration{"QRCodeGeneration",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 

ios/chrome/browser/ui/ui_feature_flags.h

@@ -45,9 +45,6 @@ extern const base::Feature kClearSyncedData;
 // Verify if the crash in https://crbug.com/816427 is fixed on iOS 12.
 extern const base::Feature kFirstResponderSendAction;
 
-// Feature flag to enable the new sign-in architecture.
-extern const base::Feature kNewSigninArchitecture;
-
 // Feature flag to enable QR code generation for a URL.
 extern const base::Feature kQRCodeGeneration;