components: Cleanup class/struct fwd declarations

components/pairing/controller_pairing_controller.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_PAIRING_CONTROLLER_PAIRING_CONTROLLER_H_
 #define COMPONENTS_PAIRING_CONTROLLER_PAIRING_CONTROLLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 
-namespace chromeos {
-class UserContext;
-}
-
-namespace content {
-class BrowserContext;
-}
-
 namespace pairing_chromeos {
 
 class ControllerPairingController {
  public:
   enum Stage {
     STAGE_NONE,
     STAGE_INITIALIZATION_ERROR,
     STAGE_DEVICES_DISCOVERY,
     STAGE_DEVICE_NOT_FOUND,
     STAGE_ESTABLISHING_CONNECTION,
@@ skipping 81 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ControllerPairingController);
 };
 
 }  // namespace pairing_chromeos
 
 #endif  // COMPONENTS_PAIRING_CONTROLLER_PAIRING_CONTROLLER_H_