Revert of WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioNodeInput.cpp

Index: Source/modules/webaudio/AudioNodeInput.cpp
diff --git a/Source/modules/webaudio/AudioNodeInput.cpp b/Source/modules/webaudio/AudioNodeInput.cpp
index bb157c7c74c70cc1a0022d80bd5c5def17776896..7c79549e62153cb52c4a8ce6913a42609675db6c 100644
--- a/Source/modules/webaudio/AudioNodeInput.cpp
+++ b/Source/modules/webaudio/AudioNodeInput.cpp
@@ -62,6 +62,9 @@
     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)
@@ -77,8 +80,7 @@
         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;
     }
 
@@ -86,8 +88,7 @@
     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;
     }