remoting: Cleanup class/struct fwd declarations

remoting/client/plugin/pepper_mouse_locker.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 REMOTING_CLIENT_PLUGIN_PEPPER_MOUSE_LOCKER_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_MOUSE_LOCKER_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "ppapi/cpp/mouse_lock.h"
 #include "ppapi/utility/completion_callback_factory.h"
 #include "remoting/protocol/cursor_shape_stub.h"
 
 namespace pp {
 class Instance;
 }  // namespace pp
 
 namespace remoting {
 
-class PepperInputHandler;
-
 class PepperMouseLocker : public pp::MouseLock,
                           public protocol::CursorShapeStub {
  public:
   // |instance| and |cursor_stub| must outlive |this|.
   PepperMouseLocker(
       pp::Instance* instance,
       const base::Callback<void(bool)>& enable_mouse_deltas,
       protocol::CursorShapeStub* cursor_stub);
   ~PepperMouseLocker() override;
 
@@ skipping 45 matching lines @@
 
   // Holds the current mouse lock state.
   MouseLockState mouse_lock_state_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperMouseLocker);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_MOUSE_LOCKER_H_