remoting: Cleanup class/struct fwd declarations

remoting/client/gl_desktop.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 REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_
 #define REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 
 namespace webrtc {
 class DesktopFrame;
 }  // namespace webrtc
 
 namespace remoting {
 
 class GlCanvas;
-class GlRenderLayer;
 
 // This class draws the desktop on the canvas.
 class GlDesktop {
  public:
   GlDesktop();
   virtual ~GlDesktop();
 
   // |frame| can be either a full frame or updated regions only frame.
   void SetVideoFrame(const webrtc::DesktopFrame& frame);
 
@@ skipping 15 matching lines @@
   webrtc::DesktopSize last_desktop_size_;
   int max_texture_size_ = 0;
   GlCanvas* canvas_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(GlDesktop);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_