ime: Remove flags for launched feature.

Native rule-based has already been launched for 2 milestones. Deleting
the flags code related to it.

The corresponding internal code was deleted in cl/307494837.

Bug: 1034355
Change-Id: I831816b9dd023c14f2e21017af9b2fa69983c88b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367300Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802988}

chrome/browser/chromeos/input_method/native_input_method_engine.cc

@@ -29,9 +29,7 @@ ui::IMEInputContextHandlerInterface* GetInputContext() {
 }
 
 bool ShouldEngineUseMojo(const std::string& engine_id) {
-  return base::FeatureList::IsEnabled(
-             chromeos::features::kNativeRuleBasedTyping) &&
-         base::StartsWith(engine_id, "vkd_", base::CompareCase::SENSITIVE);
+  return base::StartsWith(engine_id, "vkd_", base::CompareCase::SENSITIVE);
 }
 
 std::string NormalizeString(const std::string& str) {

chrome/browser/chromeos/input_method/native_input_method_engine_browsertest.cc

@@ -141,8 +141,7 @@ class NativeInputMethodEngineTest : public InProcessBrowserTest,
  public:
   NativeInputMethodEngineTest() : input_method_(this) {
     feature_list_.InitWithFeatures(
-        /*enabled_features=*/{chromeos::features::kNativeRuleBasedTyping,
-                              chromeos::features::kAssistPersonalInfo,
+        /*enabled_features=*/{chromeos::features::kAssistPersonalInfo,
                               chromeos::features::kEmojiSuggestAddition},
         /*disabled_features=*/{});
   }

chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc

@@ -590,11 +590,9 @@ bool InputImeEventRouter::RegisterImeExtension(
   }
 
   auto observer = std::make_unique<ImeObserverChromeOS>(extension_id, profile);
-  auto engine =
-      (extension_id == "jkghodnilhceideoidjikpgommlajknk" &&
-       base::FeatureList::IsEnabled(chromeos::features::kNativeRuleBasedTyping))
-          ? std::make_unique<chromeos::NativeInputMethodEngine>()
-          : std::make_unique<chromeos::InputMethodEngine>();
+  auto engine = extension_id == "jkghodnilhceideoidjikpgommlajknk"
+                    ? std::make_unique<chromeos::NativeInputMethodEngine>()
+                    : std::make_unique<chromeos::InputMethodEngine>();
   engine->Initialize(std::move(observer), extension_id.c_str(), profile);
   engine_map_[extension_id] = std::move(engine);
 

chrome/browser/extensions/api/virtual_keyboard_private/chrome_virtual_keyboard_delegate.cc

@@ -417,9 +417,6 @@ void ChromeVirtualKeyboardDelegate::OnHasInputDevices(
   features->AppendString(GenerateFeatureFlag(
       "assistiveAutoCorrect",
       base::FeatureList::IsEnabled(chromeos::features::kAssistAutoCorrect)));
-  features->AppendString(GenerateFeatureFlag(
-      "nativerulebased", base::FeatureList::IsEnabled(
-                             chromeos::features::kNativeRuleBasedTyping)));
 
   results->Set("features", std::move(features));
 

chromeos/constants/chromeos_features.cc

@@ -322,10 +322,6 @@ const base::Feature kMinimumChromeVersion{"MinimumChromeVersion",
 // ChromeOS Media App. https://crbug.com/996088.
 const base::Feature kMediaApp{"MediaApp", base::FEATURE_ENABLED_BY_DEFAULT};
 
-// Enable or disable native typing for rule-based input methods.
-const base::Feature kNativeRuleBasedTyping{"NativeRuleBasedTyping",
-                                           base::FEATURE_ENABLED_BY_DEFAULT};
-
 // Controls whether to use screen priorities to decide if transition from one
 // Oobe screen to another is allowed.
 // TODO(https://crbug.com/1064271): Remove this flag once the feature is stable.

chromeos/constants/chromeos_features.h

@@ -139,8 +139,6 @@ COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const base::Feature kMediaApp;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kMinimumChromeVersion;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
-extern const base::Feature kNativeRuleBasedTyping;
-COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kNewOsSettingsSearch;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kOobeScreensPriority;