Remove references to Profile from browser_context_keyed_service.

chrome/browser/extensions/api/preference/preference_api.h

 // Copyright (c) 2012 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_PREFERENCE_PREFERENCE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_API_H__
 
 #include <string>
 
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 27 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PreferenceEventRouter);
 };
 
 class PreferenceAPI : public ProfileKeyedAPI,
                       public EventRouter::Observer {
  public:
   explicit PreferenceAPI(Profile* profile);
   virtual ~PreferenceAPI();
 
-  // ProfileKeyedService implementation.
+  // BrowserContextKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
   // ProfileKeyedAPI implementation.
   static ProfileKeyedAPIFactory<PreferenceAPI>* GetFactoryInstance();
 
   // EventRouter::Observer implementation.
   virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
 
  private:
   friend class ProfileKeyedAPIFactory<PreferenceAPI>;
@@ skipping 80 matching lines @@
  protected:
   virtual ~ClearPreferenceFunction();
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_API_H__