MediaStreamAudioDestinationNode should inherit AudioNode

LayoutTests/webaudio/mediastreamaudiodestinationnode.html

Index: LayoutTests/webaudio/mediastreamaudiodestinationnode.html
diff --git a/LayoutTests/webaudio/mediastreamaudiodestinationnode.html b/LayoutTests/webaudio/mediastreamaudiodestinationnode.html
index 88ba84e15d809bbb001cd9770ba2e13ca1814093..60c9484281818f847379e7d94aa0ad49d18aa91f 100644
--- a/LayoutTests/webaudio/mediastreamaudiodestinationnode.html
+++ b/LayoutTests/webaudio/mediastreamaudiodestinationnode.html
@@ -14,6 +14,7 @@
 description("Basic tests for MediaStreamAudioDestinationNode API.");
 
 var context = 0;
+var mediaStreamDestination = 0;

[arv (Not doing code reviews), 2013/07/08 21:35:43]

why 0?

[do-not-use, 2013/07/09 06:37:28]

For consistency with the line above but this is not needed indeed. I'll remove
the initialization.

 
 function runTest() {
     if (window.testRunner) {
@@ -22,7 +23,10 @@ function runTest() {
 
     context = new webkitAudioContext();
 
-    var mediaStreamDestination = context.createMediaStreamDestination();
+    mediaStreamDestination = context.createMediaStreamDestination();
+
+    // MediaStreamAudioDestinationNode should inherit AudioNode.
+    shouldBe('mediaStreamDestination.__proto__.__proto__', 'AudioNode.prototype');
 
     // Check number of inputs and outputs.
     if (mediaStreamDestination.numberOfInputs == 1)