chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/status/data_promo_notification.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_CHROMEOS_STATUS_DATA_PROMO_NOTIFICATION_H_
 #define CHROME_BROWSER_CHROMEOS_STATUS_DATA_PROMO_NOTIFICATION_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/network/network_state_handler_observer.h"
 
 class PrefRegistrySimple;
 
-namespace views {
-class View;
-}
-
 namespace chromeos {
 
 // This class is responsible for triggering cellular network related
 // notifications, specifically:
 // * "Chrome will use mobile data..." when Cellular is the Default network
 //   for the first time.
 // * Data Promotion notifications when available / appropriate.
 class DataPromoNotification : public NetworkStateHandlerObserver {
  public:
   DataPromoNotification();
@@ skipping 17 matching lines @@
 
   // Factory for delaying showing promo notification.
   base::WeakPtrFactory<DataPromoNotification> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataPromoNotification);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_STATUS_DATA_PROMO_NOTIFICATION_H_