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

webrtc/video/video_encoder.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 168 matching lines @@
     return fallback_encoder_->OnDroppedFrame();
   return encoder_->OnDroppedFrame();
 }
 
 bool VideoEncoderSoftwareFallbackWrapper::SupportsNativeHandle() const {
   if (fallback_encoder_)
     return fallback_encoder_->SupportsNativeHandle();
   return encoder_->SupportsNativeHandle();
 }
 
-const char* VideoEncoderSoftwareFallbackWrapper::ImplementationName() const {
-  if (fallback_encoder_)
-    return fallback_implementation_name_.c_str();
-  return encoder_->ImplementationName();
-}
-
 }  // namespace webrtc