Revert of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.

webrtc/modules/video_coding/h264_sps_pps_tracker.cc

Index: webrtc/modules/video_coding/h264_sps_pps_tracker.cc
diff --git a/webrtc/modules/video_coding/h264_sps_pps_tracker.cc b/webrtc/modules/video_coding/h264_sps_pps_tracker.cc
index 3f11eb5f5b2eb78bb9debdfa45ed7545b0dc33ae..7bcc2b7c5e47d0293fa903d2c93f0cff309487b3 100644
--- a/webrtc/modules/video_coding/h264_sps_pps_tracker.cc
+++ b/webrtc/modules/video_coding/h264_sps_pps_tracker.cc
@@ -67,7 +67,7 @@
         // If this is the first packet of an IDR, make sure we have the required
         // SPS/PPS and also calculate how much extra space we need in the buffer
         // to prepend the SPS/PPS to the bitstream with start codes.
-        if (video_header.is_first_packet_in_frame) {
+        if (video_header.isFirstPacket) {
           if (nalu.pps_id == -1) {
             LOG(LS_WARNING) << "No PPS id in IDR nalu.";
             return kRequestKeyframe;
@@ -108,7 +108,7 @@
   if (codec_header.packetization_type == kH264StapA) {
     const uint8_t* nalu_ptr = data + 1;
     while (nalu_ptr < data + data_size) {
-      RTC_DCHECK(video_header.is_first_packet_in_frame);
+      RTC_DCHECK(video_header.isFirstPacket);
       required_size += sizeof(start_code_h264);
 
       // The first two bytes describe the length of a segment.
@@ -119,7 +119,7 @@
       nalu_ptr += segment_length;
     }
   } else {
-    if (video_header.is_first_packet_in_frame)
+    if (video_header.isFirstPacket)
       required_size += sizeof(start_code_h264);
     required_size += data_size;
   }
@@ -167,7 +167,7 @@
       nalu_ptr += segment_length;
     }
   } else {
-    if (video_header.is_first_packet_in_frame) {
+    if (video_header.isFirstPacket) {
       memcpy(insert_at, start_code_h264, sizeof(start_code_h264));
       insert_at += sizeof(start_code_h264);
     }