Revert of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.

webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
@@ skipping 671 matching lines @@
   ParseAndCheckPacket(packet, expected_, kHeaderLength, sizeof(packet));
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseFirstPacketInKeyFrame) {
   uint8_t packet[2] = {0};
   packet[0] = 0x08;  // I:0 P:0 L:0 F:0 B:1 E:0 V:0 R:0
 
   RtpDepacketizer::ParsedPayload parsed;
   ASSERT_TRUE(depacketizer_->Parse(&parsed, packet, sizeof(packet)));
   EXPECT_EQ(kVideoFrameKey, parsed.frame_type);
-  EXPECT_TRUE(parsed.type.Video.is_first_packet_in_frame);
+  EXPECT_TRUE(parsed.type.Video.isFirstPacket);
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseLastPacketInDeltaFrame) {
   uint8_t packet[2] = {0};
   packet[0] = 0x44;  // I:0 P:1 L:0 F:0 B:0 E:1 V:0 R:0
 
   RtpDepacketizer::ParsedPayload parsed;
   ASSERT_TRUE(depacketizer_->Parse(&parsed, packet, sizeof(packet)));
   EXPECT_EQ(kVideoFrameDelta, parsed.frame_type);
-  EXPECT_FALSE(parsed.type.Video.is_first_packet_in_frame);
+  EXPECT_FALSE(parsed.type.Video.isFirstPacket);
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseResolution) {
   const uint16_t kWidth[2] = {640, 1280};
   const uint16_t kHeight[2] = {360, 720};
   uint8_t packet[20] = {0};
   packet[0] = 0x0A;  // I:0 P:0 L:0 F:0 B:1 E:0 V:1 R:0
   packet[1] = (1 << 5) | (1 << 4) | 0;  // N_S:1 Y:1 G:0
   packet[2] = kWidth[0] >> 8;
   packet[3] = kWidth[0] & 0xFF;
@@ skipping 17 matching lines @@
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseFailsForTooShortBufferToFitPayload) {
   const uint8_t kHeaderLength = 1;
   uint8_t packet[kHeaderLength] = {0};
   RtpDepacketizer::ParsedPayload parsed;
   EXPECT_FALSE(depacketizer_->Parse(&parsed, packet, sizeof(packet)));
 }
 
 }  // namespace webrtc