Get rid of custom bindings for AudioContext's constructor

LayoutTests/webaudio/audionode.html

Index: LayoutTests/webaudio/audionode.html
diff --git a/LayoutTests/webaudio/audionode.html b/LayoutTests/webaudio/audionode.html
index f5baec71cb6c0655095f05d24bb99617603be877..c01604fc145ac0a2940504ecabb3b1355c9825ca 100644
--- a/LayoutTests/webaudio/audionode.html
+++ b/LayoutTests/webaudio/audionode.html
@@ -15,6 +15,7 @@ description("Basic tests for AudioNode API.");
 
 var context = 0;
 var context2 = 0;
+var context3 = 0;
 
 function runTest() {
     if (window.testRunner) {
@@ -101,6 +102,9 @@ function runTest() {
         testPassed("exception thrown when creating audio context with not enough arguments.");
     }
 
+    // Create a new offline audio context using the deprecated AudioContext constructor.
+    shouldNotThrow("context3 = new webkitAudioContext(1, 44100, 44100)");
+
     // Ensure it is an EventTarget
     try {
         audioNode.addEventListener('testEvent', function(){