chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/net/wake_on_wifi_connection_observer.h

 // Copyright 2016 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_NET_WAKE_ON_WIFI_CONNECTION_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_NET_WAKE_ON_WIFI_CONNECTION_OBSERVER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/net/wake_on_wifi_manager.h"
 #include "components/gcm_driver/gcm_connection_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "net/base/ip_endpoint.h"
 
 class Profile;
 
 namespace chromeos {
 
-class ConnectionObserverTest;
 class NetworkDeviceHandler;
 
 // Simple class that listens for a connection to the GCM server and passes the
 // connection information down to shill. Each instance of this class is
 // associated with a profile.
 class WakeOnWifiConnectionObserver : public gcm::GCMConnectionObserver {
  public:
   ~WakeOnWifiConnectionObserver() override;
 
   // Handles the case when the wifi properties have been received along with
@@ skipping 31 matching lines @@
   bool wifi_properties_received_;
   WakeOnWifiManager::WakeOnWifiFeature feature_;
   NetworkDeviceHandler* network_device_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WakeOnWifiConnectionObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NET_WAKE_ON_WIFI_CONNECTION_OBSERVER_H_