chrome: Cleanup class/struct forward declarations

chrome/browser/apps/drive/drive_app_provider.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_APPS_DRIVE_DRIVE_APP_PROVIDER_H_
 #define CHROME_BROWSER_APPS_DRIVE_DRIVE_APP_PROVIDER_H_
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "components/drive/drive_app_registry_observer.h"
 #include "extensions/browser/extension_registry_observer.h"
 
 namespace drive {
 struct DriveAppInfo;
 }
 
 class BrowserContextKeyedServiceFactory;
 class DriveAppConverter;
 class DriveAppMapping;
 class DriveAppUninstallSyncService;
 class DriveServiceBridge;
-class ExtensionService;
 class Profile;
 
 // DriveAppProvider is the integration point for Drive apps. It ensures each
 // Drive app has a corresponding Chrome app in the extension system. If there
 // is no matching Chrome app, a local URL app would be created. The class
 // processes app changes from both DriveAppRegistry and extension system to
 // keep the two in sync.
 class DriveAppProvider : public drive::DriveAppRegistryObserver,
                          public extensions::ExtensionRegistryObserver {
  public:
@@ skipping 62 matching lines @@
 
   // Tracks the pending web app convertions.
   ScopedVector<DriveAppConverter> pending_converters_;
 
   base::WeakPtrFactory<DriveAppProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveAppProvider);
 };
 
 #endif  // CHROME_BROWSER_APPS_DRIVE_DRIVE_APP_PROVIDER_H_