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

Source/modules/webaudio/AudioNodeOutput.cpp

Index: Source/modules/webaudio/AudioNodeOutput.cpp
diff --git a/Source/modules/webaudio/AudioNodeOutput.cpp b/Source/modules/webaudio/AudioNodeOutput.cpp
index 773f011ab938f72e334c97493222f5a23279f784..d1fd4a1aee0fd3a1cd0b2520e9348a6d723838c4 100644
--- a/Source/modules/webaudio/AudioNodeOutput.cpp
+++ b/Source/modules/webaudio/AudioNodeOutput.cpp
@@ -222,9 +222,9 @@ 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;
     }
 }
 
@@ -233,9 +233,9 @@ 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;
     }
 }