components: Cleanup class/struct fwd declarations

components/gcm_driver/gcm_driver_desktop.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 COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 11 matching lines @@
 #include "components/gcm_driver/gcm_connection_observer.h"
 #include "components/gcm_driver/gcm_driver.h"
 
 class PrefService;
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 }
 
-namespace extensions {
-class ExtensionGCMAppHandlerTest;
-}
-
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace gcm {
 
 class GCMAccountMapper;
 class GCMAppHandler;
 class GCMClientFactory;
 class GCMDelayedTaskController;
@@ skipping 194 matching lines @@
 
   // Used to pass a weak pointer to the IO worker.
   base::WeakPtrFactory<GCMDriverDesktop> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriverDesktop);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_