Move optional.h to webrtc/api/

webrtc/pc/srtpfilter.h

 /*
  *  Copyright 2009 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_SRTPFILTER_H_
 #define WEBRTC_PC_SRTPFILTER_H_
 
 #include <list>
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/media/base/cryptoparams.h"
 #include "webrtc/p2p/base/sessiondescription.h"
 #include "webrtc/rtc_base/basictypes.h"
 #include "webrtc/rtc_base/buffer.h"
 #include "webrtc/rtc_base/constructormagic.h"
 #include "webrtc/rtc_base/criticalsection.h"
-#include "webrtc/rtc_base/optional.h"
 #include "webrtc/rtc_base/sslstreamadapter.h"
 #include "webrtc/rtc_base/thread_checker.h"
 
 // Forward declaration to avoid pulling in libsrtp headers here
 struct srtp_event_data_t;
 struct srtp_ctx_t_;
 
 namespace cricket {
 
 void ShutdownSrtp();
@@ skipping 97 matching lines @@
   CryptoParams applied_recv_params_;
   rtc::Optional<int> send_cipher_suite_;
   rtc::Optional<int> recv_cipher_suite_;
   rtc::Buffer send_key_;
   rtc::Buffer recv_key_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_PC_SRTPFILTER_H_