Refactor prefs.js for MD-Settings

chrome/browser/extensions/api/settings_private/settings_private_delegate.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_SETTINGS_PRIVATE_SETTINGS_PRIVATE_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_DELEGATE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 17 matching lines @@
 
 // Manages all the pref service interactions.
 // Use SettingsPrivateDelegateFactory to create a SettingsPrivateDelegate
 // object.
 class SettingsPrivateDelegate : public KeyedService {
  public:
   explicit SettingsPrivateDelegate(Profile* profile);
   ~SettingsPrivateDelegate() override;
 
   // Sets the pref with the given name and value in the proper PrefService.
-  virtual bool SetPref(const std::string& name, const base::Value* value);
+  virtual PrefsUtil::SetPrefResult SetPref(
+      const std::string& name, const base::Value* value);
 
   // Gets the value of the pref with the given |name|.
   virtual scoped_ptr<base::Value> GetPref(const std::string& name);
 
   // Gets the values of all whitelisted prefs.
   virtual scoped_ptr<base::Value> GetAllPrefs();
 
  protected:
   Profile* profile_;  // weak; not owned by us
   scoped_ptr<PrefsUtil> prefs_util_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SettingsPrivateDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_DELEGATE_H_