Optimize startup time of notification code by removing unused code.

ui/message_center/notifier_settings.h

 // Copyright (c) 2013 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 UI_MESSAGE_CENTER_NOTIFIER_SETTINGS_H_
 #define UI_MESSAGE_CENTER_NOTIFIER_SETTINGS_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 98 matching lines @@
   bool enabled;
 
   // The icon image of the notifier. The extension icon or favicon.
   gfx::Image icon;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Notifier);
 };
 
 struct MESSAGE_CENTER_EXPORT NotifierGroup {
-  NotifierGroup(const gfx::Image& icon,
-                const base::string16& name,
-                const base::string16& login_info);
+  NotifierGroup(const base::string16& name, const base::string16& login_info);
   ~NotifierGroup();
 
-  // Icon of a notifier group.
-  const gfx::Image icon;
-
   // Display name of a notifier group.
   const base::string16 name;
 
   // More display information about the notifier group.
   base::string16 login_info;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NotifierGroup);
 };
 
@@ skipping 59 matching lines @@
 
   // Called upon request for more information about a particular notifier.
   virtual void OnNotifierAdvancedSettingsRequested(
       const NotifierId& notifier_id,
       const std::string* notification_id) = 0;
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_NOTIFIER_SETTINGS_H_