AudioNodeOutput::enable() and AudioNodeOutput::disable() should not be reentered

Source/modules/webaudio/AudioNodeOutput.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 204 matching lines @@
 {
     disconnectAllInputs();
     disconnectAllParams();
 }
 
 void AudioNodeOutput::disable()
 {
     ASSERT(context()->isGraphOwner());
 
     if (m_isEnabled) {
+        m_isEnabled = false;
         for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i)
             i->key->disable(*this);
-        m_isEnabled = false;
     }
 }
 
 void AudioNodeOutput::enable()
 {
     ASSERT(context()->isGraphOwner());
 
     if (!m_isEnabled) {
+        m_isEnabled = true;
         for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i)
             i->key->enable(*this);
-        m_isEnabled = true;
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)