remoting: Cleanup class/struct fwd declarations

remoting/host/desktop_environment.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_HOST_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_DESKTOP_ENVIRONMENT_H_
 
 #include <cstdint>
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/host/desktop_environment_options.h"
 
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
-
 namespace webrtc {
 class DesktopCapturer;
 class MouseCursorMonitor;
 }  // namespace webrtc
 
 namespace remoting {
 
-namespace protocol {
-class ClientStub;
-}  // namespace protocol
-
 class AudioCapturer;
 class ClientSessionControl;
 class InputInjector;
 class ScreenControls;
 
 // Provides factory methods for creation of audio/video capturers and event
 // executor for a given desktop environment.
 class DesktopEnvironment {
  public:
   virtual ~DesktopEnvironment() {}
@@ skipping 33 matching lines @@
       const DesktopEnvironmentOptions& options) = 0;
 
   // Returns |true| if created |DesktopEnvironment| instances support audio
   // capture.
   virtual bool SupportsAudioCapture() const = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_DESKTOP_ENVIRONMENT_H_