Change event routers from singletons to being owned by the ExtensionService.

chrome/browser/extensions/extension_preference_api.h

 // Copyright (c) 2011 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_EXTENSION_PREFERENCE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/common/notification_observer.h"
 
 class ExtensionPreferenceEventRouter : public NotificationObserver {
  public:
   explicit ExtensionPreferenceEventRouter(Profile* profile);
   virtual ~ExtensionPreferenceEventRouter();
 
+  void Init();
+
  private:
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   void OnPrefChanged(PrefService* pref_service, const std::string& pref_key);
 
   // This method dispatches events to the extension message service.
   void DispatchEvent(const std::string& extension_id,
@@ skipping 47 matching lines @@
 };
 
 class ClearPreferenceFunction : public SyncExtensionFunction {
  public:
   virtual ~ClearPreferenceFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("preferences.clear")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__