Fix race condition in MD Settings Languages page causing inconsistent settings

chrome/browser/extensions/api/language_settings_private/language_settings_private_api.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_API_H_
 
 #include "base/macros.h"
 #include "chrome/browser/extensions/chrome_extension_function_details.h"
 #include "chrome/browser/spellchecker/spellcheck_custom_dictionary.h"
@@ skipping 12 matching lines @@
  protected:
   ~LanguageSettingsPrivateGetLanguageListFunction() override;
 
   // ExtensionFunction overrides.
   ResponseAction Run() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateGetLanguageListFunction);
 };
 
-// Implements the languageSettingsPrivate.setLanguageList method.
-class LanguageSettingsPrivateSetLanguageListFunction
+// Implements the languageSettingsPrivate.enableLanguage method.
+class LanguageSettingsPrivateEnableLanguageFunction
     : public UIThreadExtensionFunction {
  public:
-  LanguageSettingsPrivateSetLanguageListFunction();
-  DECLARE_EXTENSION_FUNCTION("languageSettingsPrivate.setLanguageList",
-                             LANGUAGESETTINGSPRIVATE_SETLANGUAGELIST)
+  LanguageSettingsPrivateEnableLanguageFunction();
+  DECLARE_EXTENSION_FUNCTION("languageSettingsPrivate.enableLanguage",
+                             LANGUAGESETTINGSPRIVATE_ENABLELANGUAGE)
 
  protected:
-  ~LanguageSettingsPrivateSetLanguageListFunction() override;
+  ~LanguageSettingsPrivateEnableLanguageFunction() override;
 
   // ExtensionFunction overrides.
   ResponseAction Run() override;
 
  private:
   ChromeExtensionFunctionDetails chrome_details_;
 
-  DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateSetLanguageListFunction);
+  DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateEnableLanguageFunction);
+};
+
+// Implements the languageSettingsPrivate.disableLanguage method.
+class LanguageSettingsPrivateDisableLanguageFunction
+    : public UIThreadExtensionFunction {
+ public:
+  LanguageSettingsPrivateDisableLanguageFunction();
+  DECLARE_EXTENSION_FUNCTION("languageSettingsPrivate.disableLanguage",
+                             LANGUAGESETTINGSPRIVATE_DISABLELANGUAGE)
+
+ protected:
+  ~LanguageSettingsPrivateDisableLanguageFunction() override;
+
+  // ExtensionFunction overrides.
+  ResponseAction Run() override;
+
+ private:
+  ChromeExtensionFunctionDetails chrome_details_;
+
+  DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateDisableLanguageFunction);
 };
 
 // Implements the languageSettingsPrivate.getSpellcheckDictionaryStatuses
 // method.
 class LanguageSettingsPrivateGetSpellcheckDictionaryStatusesFunction
     : public UIThreadExtensionFunction {
  public:
   LanguageSettingsPrivateGetSpellcheckDictionaryStatusesFunction();
   DECLARE_EXTENSION_FUNCTION(
       "languageSettingsPrivate.getSpellcheckDictionaryStatuses",
@@ skipping 149 matching lines @@
 
  private:
   ChromeExtensionFunctionDetails chrome_details_;
 
   DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateRemoveInputMethodFunction);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_API_H_