Fix code style and gyp files in cast to build cast_unittest

media/cast/rtp_common/mock_rtp_payload_feedback.h

 // Copyright 2013 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 MEDIA_CAST_RTP_COMMON_MOCK_RTP_PAYLOAD_FEEDBACK_H_
 #define MEDIA_CAST_RTP_COMMON_MOCK_RTP_PAYLOAD_FEEDBACK_H_
 
 #include "media/cast/rtp_common/rtp_defines.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace media {
 namespace cast {
 
 class MockRtpPayloadFeedback : public RtpPayloadFeedback {
  public:
+  MockRtpPayloadFeedback();
+  virtual ~MockRtpPayloadFeedback();
+
   MOCK_METHOD1(CastFeedback,
                void(const RtcpCastMessage& cast_feedback));
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_RTP_COMMON_MOCK_RTP_PAYLOAD_FEEDBACK_H_