Revert of WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioNodeInput.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 44 matching lines @@
     if (!output || !node())
         return;
 
     // Check if we're already connected to this output.
     if (m_outputs.contains(output))
         return;
 
     output->addInput(this);
     m_outputs.add(output);
     changedOutputs();
+
+    // Sombody has just connected to us, so count it as a reference.
+    node()->ref(AudioNode::RefTypeConnection);
 }
 
 void AudioNodeInput::disconnect(AudioNodeOutput* output)
 {
     ASSERT(context()->isGraphOwner());
 
     ASSERT(output && node());
     if (!output || !node())
         return;
 
     // First try to disconnect from "active" connections.
     if (m_outputs.contains(output)) {
         m_outputs.remove(output);
         changedOutputs();
         output->removeInput(this);
-        // Note: it's important to return immediately after removeInput() calls
-        // since the node may be deleted.
+        node()->deref(AudioNode::RefTypeConnection); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
         return;
     }
 
     // Otherwise, try to disconnect from disabled connections.
     if (m_disabledOutputs.contains(output)) {
         m_disabledOutputs.remove(output);
         output->removeInput(this);
-        // Note: it's important to return immediately after all removeInput() calls
-        // since the node may be deleted.
+        node()->deref(AudioNode::RefTypeConnection); // Note: it's important to return immediately after all deref() calls since the node may be deleted.
         return;
     }
 
     ASSERT_NOT_REACHED();
 }
 
 void AudioNodeInput::disable(AudioNodeOutput* output)
 {
     ASSERT(context()->isGraphOwner());
 
@@ skipping 137 matching lines @@
 
     // Handle multiple connections case.
     sumAllConnections(internalSummingBus, framesToProcess);
 
     return internalSummingBus;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)