Revert of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.

webrtc/video/video_send_stream_tests.cc

 /*
  *  Copyright (c) 2013 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 <algorithm>  // max
@@ skipping 2923 matching lines @@
       expected_height /= 2;
     }
   }
 
   void CompareConsecutiveFrames(const RTPHeader& header,
                                 const RTPVideoHeader& video) const {
     const RTPVideoHeaderVP9& vp9 = video.codecHeader.VP9;
 
     bool new_frame = packets_sent_ == 0 ||
                      IsNewerTimestamp(header.timestamp, last_header_.timestamp);
-    EXPECT_EQ(new_frame, video.is_first_packet_in_frame);
+    EXPECT_EQ(new_frame, video.isFirstPacket);
     if (!new_frame) {
       EXPECT_FALSE(last_header_.markerBit);
       EXPECT_EQ(last_header_.timestamp, header.timestamp);
       EXPECT_EQ(last_vp9_.picture_id, vp9.picture_id);
       EXPECT_EQ(last_vp9_.temporal_idx, vp9.temporal_idx);
       EXPECT_EQ(last_vp9_.tl0_pic_idx, vp9.tl0_pic_idx);
       VerifySpatialIdxWithinFrame(vp9);
       return;
     }
     // New frame.
@@ skipping 256 matching lines @@
    private:
     Call* call_;
     rtc::CriticalSection crit_;
     uint32_t max_bitrate_kbps_ GUARDED_BY(&crit_);
   } test;
 
   RunBaseTest(&test);
 }
 
 }  // namespace webrtc