Add codec name to CodecSpecificInfo and get the codec name stats from there instead.

webrtc/video/send_statistics_proxy_unittest.cc

Index: webrtc/video/send_statistics_proxy_unittest.cc
diff --git a/webrtc/video/send_statistics_proxy_unittest.cc b/webrtc/video/send_statistics_proxy_unittest.cc
index 1e9287749e546fea274442f0df82f09904b57d05..593c93b8e1aa859150ceacc39408a20e5c1a64e2 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -146,13 +146,11 @@ TEST_F(SendStatisticsProxyTest, EncodedBitrateAndFramerate) {
   int media_bitrate_bps = 500;
   int encode_fps = 29;
 
-  statistics_proxy_->OnEncoderStatsUpdate(encode_fps, media_bitrate_bps,
-                                          "encoder name");
+  statistics_proxy_->OnEncoderStatsUpdate(encode_fps, media_bitrate_bps);
 
   VideoSendStream::Stats stats = statistics_proxy_->GetStats();
   EXPECT_EQ(media_bitrate_bps, stats.media_bitrate_bps);
   EXPECT_EQ(encode_fps, stats.encode_frame_rate);
-  EXPECT_EQ("encoder name", stats.encoder_implementation_name);
 }
 
 TEST_F(SendStatisticsProxyTest, Suspended) {