remoting: Cleanup class/struct fwd declarations

remoting/client/plugin/pepper_input_handler.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 REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 
 namespace pp {
 class InputEvent;
 }  // namespace pp
 
 namespace remoting {
 
 namespace protocol {
-class InputStub;
 class InputEventTracker;
 } // namespace protocol
 
 class PepperInputHandler {
  public:
   // Create a PepperInputHandler using the specified InputEventTracker to
   // handle auto-release. The InputEventTracker instance must remain valid
   // for the lifetime of the PepperInputHandler.
   explicit PepperInputHandler(protocol::InputEventTracker* input_tracker);
 
@@ skipping 48 matching lines @@
 
   // Whether or not to check for stuck modifier keys on keyboard input events.
   bool detect_stuck_modifiers_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperInputHandler);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_