Move optional.h to webrtc/api/

webrtc/test/video_capturer.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #ifndef WEBRTC_TEST_VIDEO_CAPTURER_H_
 #define WEBRTC_TEST_VIDEO_CAPTURER_H_
 
 #include <stddef.h>
 
 #include <memory>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/api/video/video_frame.h"
 #include "webrtc/media/base/videoadapter.h"
 #include "webrtc/media/base/videosourceinterface.h"
 #include "webrtc/rtc_base/criticalsection.h"
-#include "webrtc/rtc_base/optional.h"
 
 namespace cricket {
 class VideoAdapter;
 }  // namespace cricket
 
 namespace webrtc {
 class Clock;
 namespace test {
 
 class VideoCapturer : public rtc::VideoSourceInterface<VideoFrame> {
@@ skipping 11 matching lines @@
   rtc::Optional<VideoFrame> AdaptFrame(const VideoFrame& frame);
   rtc::VideoSinkWants GetSinkWants();
 
  private:
   const std::unique_ptr<cricket::VideoAdapter> video_adapter_;
 };
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_VIDEO_CAPTURER_H_