remoting: Cleanup class/struct fwd declarations

remoting/host/host_mock_objects.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_HOST_MOCK_OBJECTS_H_
 #define REMOTING_HOST_HOST_MOCK_OBJECTS_H_
 
 #include <cstdint>
 #include <memory>
 #include <string>
@@ skipping 11 matching lines @@
 #include "remoting/host/screen_resolution.h"
 #include "remoting/host/security_key/security_key_auth_handler.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/event.pb.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor_monitor.h"
 
 namespace base {
 class TimeDelta;
-class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace remoting {
 
 class MockDesktopEnvironment : public DesktopEnvironment {
  public:
   MockDesktopEnvironment();
   ~MockDesktopEnvironment() override;
 
   MOCK_METHOD0(CreateAudioCapturerPtr, AudioCapturer*());
@@ skipping 144 matching lines @@
   MOCK_METHOD2(Init, void(Callback* callback, Mode mode));
   MOCK_METHOD0(Capture, void());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockMouseCursorMonitor);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_MOCK_OBJECTS_H_