Revert of Add a flags field to video timing extension.

webrtc/modules/rtp_rtcp/source/rtp_header_extensions.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_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_
@@ skipping 112 matching lines @@
                     VideoContentType* content_type);
   static size_t ValueSize(VideoContentType) {
     return kValueSizeBytes;
   }
   static bool Write(uint8_t* data, VideoContentType content_type);
 };
 
 class VideoTimingExtension {
  public:
   static constexpr RTPExtensionType kId = kRtpExtensionVideoTiming;
-  static constexpr uint8_t kValueSizeBytes = 13;
+  static constexpr uint8_t kValueSizeBytes = 12;
   static constexpr const char kUri[] =
       "http://www.webrtc.org/experiments/rtp-hdrext/video-timing";
 
   static bool Parse(rtc::ArrayView<const uint8_t> data,
                     VideoSendTiming* timing);
   static size_t ValueSize(const VideoSendTiming&) { return kValueSizeBytes; }
   static bool Write(uint8_t* data, const VideoSendTiming& timing);
 
   static size_t ValueSize(uint16_t time_delta_ms, uint8_t idx) {
     return kValueSizeBytes;
@@ skipping 33 matching lines @@
 };
 
 class RtpMid : public BaseRtpStringExtension {
  public:
   static constexpr RTPExtensionType kId = kRtpExtensionMid;
   static constexpr const char kUri[] = "urn:ietf:params:rtp-hdrext:sdes:mid";
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_