Move optional.h to webrtc/api/

webrtc/pc/webrtcsession.h

 /*
  *  Copyright 2012 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_PC_WEBRTCSESSION_H_
 #define WEBRTC_PC_WEBRTCSESSION_H_
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/api/peerconnectioninterface.h"
 #include "webrtc/api/statstypes.h"
 #include "webrtc/call/call.h"
 #include "webrtc/p2p/base/candidate.h"
 #include "webrtc/p2p/base/transportcontroller.h"
 #include "webrtc/pc/datachannel.h"
 #include "webrtc/pc/mediasession.h"
 #include "webrtc/rtc_base/constructormagic.h"
-#include "webrtc/rtc_base/optional.h"
 #include "webrtc/rtc_base/sigslot.h"
 #include "webrtc/rtc_base/sslidentity.h"
 #include "webrtc/rtc_base/thread.h"
 
 #ifdef HAVE_QUIC
 #include "webrtc/pc/quicdatatransport.h"
 #endif  // HAVE_QUIC
 
 namespace cricket {
 
@@ skipping 629 matching lines @@
 
 #ifdef HAVE_QUIC
   std::unique_ptr<QuicDataTransport> quic_data_transport_;
 #endif  // HAVE_QUIC
 
   RTC_DISALLOW_COPY_AND_ASSIGN(WebRtcSession);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_PC_WEBRTCSESSION_H_