Move rtp header extension length check from Packet::FindExtension to ExtensionT::Parse

webrtc/modules/rtp_rtcp/source/rtp_packet_unittest.cc

 /*
  *  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.
  */
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
@@ skipping 340 matching lines @@
   EXPECT_TRUE(packet.Parse(kPacketWithTO, sizeof(kPacketWithTO)));
 
   EXPECT_FALSE(packet.HasRawExtension(kAudioLevelExtensionId));
   EXPECT_TRUE(packet.GetRawExtension(kAudioLevelExtensionId).empty());
 
   EXPECT_TRUE(packet.HasRawExtension(kTransmissionOffsetExtensionId));
 
   int32_t time_offset = 0;
   auto raw_extension = packet.GetRawExtension(kTransmissionOffsetExtensionId);
   EXPECT_EQ(raw_extension.size(), TransmissionOffset::kValueSizeBytes);
-  EXPECT_TRUE(TransmissionOffset::Parse(raw_extension.data(), &time_offset));
+  EXPECT_TRUE(TransmissionOffset::Parse(raw_extension, &time_offset));
 
   EXPECT_EQ(time_offset, kTimeOffset);
 }
 
 }  // namespace webrtc