Require use of AudioBus::create() to avoid ref-counting issues

Source/core/platform/chromium/support/WebAudioBus.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 31 matching lines @@
 using namespace WebCore;
 
 namespace WebKit {
 
 class WebAudioBusPrivate : public AudioBus {
 };
 
 void WebAudioBus::initialize(unsigned numberOfChannels, size_t length, double sampleRate)
 {        
 #if ENABLE(WEB_AUDIO)
-    AudioBus* audioBus = new AudioBus(numberOfChannels, length);
+    RefPtr<AudioBus> audioBus = AudioBus::create(numberOfChannels, length);
     audioBus->setSampleRate(sampleRate);
 
     if (m_private)
-        delete m_private;
-    m_private = static_cast<WebAudioBusPrivate*>(audioBus);
+        (static_cast<AudioBus*>(m_private))->deref();
+
+    audioBus->ref();
+    m_private = static_cast<WebAudioBusPrivate*>(audioBus.get());
 #else
     ASSERT_NOT_REACHED();
 #endif
 }
 
 void WebAudioBus::resizeSmaller(size_t newLength)
 {
 #if ENABLE(WEB_AUDIO)
     ASSERT(m_private);
     if (m_private) {
         ASSERT(newLength <= length());
         m_private->resizeSmaller(newLength);
     }
 #else
     ASSERT_NOT_REACHED();
 #endif
 }
 
 void WebAudioBus::reset()
 {
 #if ENABLE(WEB_AUDIO)
-    delete m_private;
-    m_private = 0;
+    if (m_private) {
+        (static_cast<AudioBus*>(m_private))->deref();
+        m_private = 0;
+    }
 #else
     ASSERT_NOT_REACHED();
 #endif
 }
 
 unsigned WebAudioBus::numberOfChannels() const
 {
 #if ENABLE(WEB_AUDIO)
     if (!m_private)
         return 0;
@@ skipping 47 matching lines @@
     RefPtr<AudioBus> audioBus(adoptRef(static_cast<AudioBus*>(m_private)));
     m_private = 0;
     return audioBus;
 #else
     ASSERT_NOT_REACHED();
     return 0;
 #endif
 }
 
 } // namespace WebKit