Code Cleanup for extension_prefs, as AddDisableReasons() is not required same...

Code Cleanup for extension_prefs, as AddDisableReasons() is not required same behavior can be achieved by AddDisableReason().

BUG=475911

Review URL: https://codereview.chromium.org/1073153002

Cr-Commit-Position: refs/heads/master@{#325387}

chrome/browser/extensions/extension_service.cc

@@ -1805,7 +1805,8 @@ void ExtensionService::OnExtensionInstalled(
   }
 
   if (disable_reasons)
-    extension_prefs_->AddDisableReasons(id, disable_reasons);
+    extension_prefs_->AddDisableReason(id,
+        static_cast<Extension::DisableReason>(disable_reasons));
 
   const Extension::State initial_state =
       disable_reasons == Extension::DISABLE_NONE ? Extension::ENABLED

extensions/browser/extension_prefs.cc

@@ -759,11 +759,6 @@ void ExtensionPrefs::AddDisableReason(const std::string& extension_id,
   ModifyDisableReasons(extension_id, disable_reason, DISABLE_REASON_ADD);
 }
 
-void ExtensionPrefs::AddDisableReasons(const std::string& extension_id,
-                                       int disable_reasons) {
-  ModifyDisableReasons(extension_id, disable_reasons, DISABLE_REASON_ADD);
-}
-
 void ExtensionPrefs::RemoveDisableReason(
     const std::string& extension_id,
     Extension::DisableReason disable_reason) {

extensions/browser/extension_prefs.h

@@ -262,7 +262,6 @@ class ExtensionPrefs : public ExtensionScopedPrefs, public KeyedService {
                         Extension::DisableReason disable_reason) const;
   void AddDisableReason(const std::string& extension_id,
                         Extension::DisableReason disable_reason);
-  void AddDisableReasons(const std::string& extension_id, int disable_reasons);
   void RemoveDisableReason(const std::string& extension_id,
                            Extension::DisableReason disable_reason);
   void ClearDisableReasons(const std::string& extension_id);