Fix for audiogainnode/gain node naming in current Chrome and Safari.

tests/html/audiocontext_test.dart

 #library('AudioContextTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
 
   useHtmlConfiguration();
 
   var isAudioContext =
       predicate((x) => x is AudioContext, 'is an AudioContext');
 
   test('constructorTest', () {
       var ctx = new AudioContext();
       expect(ctx, isNotNull);
       expect(ctx, isAudioContext);
   });
   test('createBuffer', () {
       var ctx = new AudioContext();
       ArrayBufferView arrayBufferView = new Float32Array.fromList([]);
       try {
         // Test that native overload is chosen correctly. Native implementation
         // should throw 'SYNTAX_ERR' DOMException because the buffer is empty.
         AudioBuffer buffer = ctx.createBuffer(arrayBufferView.buffer, false);
       } catch (e) {
         expect(e.code, equals(DOMException.SYNTAX_ERR));
       }
   });
+
+  test('audioRenames', () {
+    AudioContext context = new AudioContext();
+    GainNode gainNode = context.createGainNode();
+    gainNode.connect(context.destination, 0, 0);
+    expect(gainNode is GainNode, isTrue);
+
+    expect(context.createAnalyser() is AnalyserNode, isTrue);
+    expect(context.createChannelMerger() is ChannelMergerNode, isTrue);
+    expect(context.createChannelSplitter() is ChannelSplitterNode, isTrue);
+    expect(context.createOscillator() is OscillatorNode, isTrue);
+    expect(context.createPanner() is PannerNode, isTrue);
+    expect(context.createJavaScriptNode(4096) is ScriptProcessorNode, isTrue);
+  });
 }