Always set need_audio_processing_ to true in WebRtcLocalAudioTrack.

content/renderer/media/webrtc_local_audio_track.cc

Index: content/renderer/media/webrtc_local_audio_track.cc
diff --git a/content/renderer/media/webrtc_local_audio_track.cc b/content/renderer/media/webrtc_local_audio_track.cc
index cae6bfe8ba38bcd85a32f75cf6c6faaa6d1514e5..ecdfc8ec7e3b556045690a51b59e5d61b69ba69c 100644
--- a/content/renderer/media/webrtc_local_audio_track.cc
+++ b/content/renderer/media/webrtc_local_audio_track.cc
@@ -34,6 +34,12 @@ WebRtcLocalAudioTrack::WebRtcLocalAudioTrack(
   // and APM (AudioProcessingModule) is turned on only for microphone data.
   DCHECK(capturer.get());
   DVLOG(1) << "WebRtcLocalAudioTrack::WebRtcLocalAudioTrack()";
+
+  // TODO(tommi): Remove this, feed audio constraints to WebRtcLocalAudioTrack
+  // and check the constraints.  This is here to fix a recent regression whereby
+  // audio processing is not enabled for WebAudio regardless of the hard coded
+  // audio constraints.  For more info: http://crbug.com/277134
+  need_audio_processing_ = true;
 }
 
 WebRtcLocalAudioTrack::~WebRtcLocalAudioTrack() {