Move optional.h to webrtc/api/

webrtc/modules/video_coding/frame_object.h

 /*
  *  Copyright (c) 2016 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_MODULES_VIDEO_CODING_FRAME_OBJECT_H_
 #define WEBRTC_MODULES_VIDEO_CODING_FRAME_OBJECT_H_
 
+#include "webrtc/api/optional.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/video_coding/encoded_frame.h"
-#include "webrtc/rtc_base/optional.h"
 
 namespace webrtc {
 namespace video_coding {
 
 class FrameObject : public webrtc::VCMEncodedFrame {
  public:
   static const uint8_t kMaxFrameReferences = 5;
 
   FrameObject();
   virtual ~FrameObject() {}
@@ skipping 67 matching lines @@
 
   // Equal to times nacked of the packet with the highet times nacked
   // belonging to this frame.
   int times_nacked_;
 };
 
 }  // namespace video_coding
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_FRAME_OBJECT_H_