Reland of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.

webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc
index 3f1ead87b53ecaea4cda6a36ac42789d00941601..c53a2ca5a2f112097060eca3b79af1077ecc4ea6 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_format_vp9_unittest.cc
@@ -689,7 +689,7 @@ TEST_F(RtpDepacketizerVp9Test, ParseFirstPacketInKeyFrame) {
   RtpDepacketizer::ParsedPayload parsed;
   ASSERT_TRUE(depacketizer_->Parse(&parsed, packet, sizeof(packet)));
   EXPECT_EQ(kVideoFrameKey, parsed.frame_type);
-  EXPECT_TRUE(parsed.type.Video.isFirstPacket);
+  EXPECT_TRUE(parsed.type.Video.is_first_packet_in_frame);
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseLastPacketInDeltaFrame) {
@@ -699,7 +699,7 @@ TEST_F(RtpDepacketizerVp9Test, ParseLastPacketInDeltaFrame) {
   RtpDepacketizer::ParsedPayload parsed;
   ASSERT_TRUE(depacketizer_->Parse(&parsed, packet, sizeof(packet)));
   EXPECT_EQ(kVideoFrameDelta, parsed.frame_type);
-  EXPECT_FALSE(parsed.type.Video.isFirstPacket);
+  EXPECT_FALSE(parsed.type.Video.is_first_packet_in_frame);
 }
 
 TEST_F(RtpDepacketizerVp9Test, ParseResolution) {