Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/api/mediastream.cc

 /*
  *  Copyright 2011 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.
  */
 
 #include "webrtc/api/mediastream.h"
+#include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 
 namespace webrtc {
 
 template <class V>
 static typename V::iterator FindTrack(V* vector,
                                       const std::string& track_id) {
   typename V::iterator it = vector->begin();
   for (; it != vector->end(); ++it) {
     if ((*it)->id() == track_id) {
@@ skipping 52 matching lines @@
   if (it != tracks->end())
     return false;
   tracks->push_back(track);
   FireOnChanged();
   return true;
 }
 
 template <typename TrackVector>
 bool MediaStream::RemoveTrack(TrackVector* tracks,
                               MediaStreamTrackInterface* track) {
-  ASSERT(tracks != NULL);
+  RTC_DCHECK(tracks != NULL);
   if (!track)
     return false;
   typename TrackVector::iterator it = FindTrack(tracks, track->id());
   if (it == tracks->end())
     return false;
   tracks->erase(it);
   FireOnChanged();
   return true;
 }
 
 }  // namespace webrtc