chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_gcm_app_handler.h

 // Copyright 2014 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_GCM_APP_HANDLER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_GCM_APP_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "components/gcm_driver/common/gcm_messages.h"
 #include "components/gcm_driver/gcm_app_handler.h"
 #include "components/gcm_driver/gcm_client.h"
 #include "components/gcm_driver/instance_id/instance_id.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_registry_observer.h"
 
 class Profile;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace gcm {
 class GCMDriver;
-class GCMProfileService;
 }
 namespace instance_id {
 class InstanceIDDriver;
 }
 
 namespace extensions {
 
 class ExtensionRegistry;
 class GcmJsEventRouter;
 
@@ skipping 63 matching lines @@
   std::unique_ptr<extensions::GcmJsEventRouter> js_event_router_;
 
   base::WeakPtrFactory<ExtensionGCMAppHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionGCMAppHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_GCM_APP_HANDLER_H_