Fix crash when changing sources after createMediaSourceElement().

content/renderer/media/render_audiosourceprovider.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/render_audiosourceprovider.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProviderClient.h"
 
@@ skipping 87 matching lines @@
   is_initialized_ = true;
 }
 
 void RenderAudioSourceProvider::setClient(
     WebKit::WebAudioSourceProviderClient* client) {
   // Synchronize with other uses of client_ and default_sink_.
   base::AutoLock auto_lock(sink_lock_);
 
   if (client && client != client_) {
     // Detach the audio renderer from normal playback.
-    default_sink_->Pause(true);
+    default_sink_->Stop();
 
     // The client will now take control by calling provideInput() periodically.
     client_ = client;
 
     if (is_initialized_) {
       // The client needs to be notified of the audio format, if available.
       // If the format is not yet available, we'll be notified later
       // when Initialize() is called.
 
       // Inform WebKit about the audio stream format.
@@ skipping 19 matching lines @@
 
     // TODO(crogers): figure out if we should volume scale here or in common
     // WebAudio code.  In any case we need to take care of volume.
     renderer_->Render(v, number_of_frames, 0);
   } else {
     // Provide silence if the source is not running.
     for (size_t i = 0; i < audio_data.size(); ++i)
       memset(audio_data[i], 0, sizeof(float) * number_of_frames);
   }
 }