Refactoring: Hide VideoCodec.codecSpecific as "private"

webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc

Index: webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc
diff --git a/webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc b/webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc
index 280270095371ce4c9f5b568186f9edca0a1d6042..556d115c9d7497e1e852ba9867030749357356fd 100644
--- a/webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/vp8_sequence_coder.cc
@@ -133,8 +133,8 @@ int SequenceCoder(webrtc::test::CommandLineParser* parser) {
   webrtc::VP8Encoder* encoder = webrtc::VP8Encoder::Create();
   webrtc::VP8Decoder* decoder = webrtc::VP8Decoder::Create();
   inst.codecType = webrtc::kVideoCodecVP8;
-  inst.codecSpecific.VP8.feedbackModeOn = false;
-  inst.codecSpecific.VP8.denoisingOn = true;
+  inst.VP8()->feedbackModeOn = false;
+  inst.VP8()->denoisingOn = true;
   inst.maxFramerate = framerate;
   inst.startBitrate = target_bitrate;
   inst.maxBitrate = 8000;