Fix sound not playing in Dartium checked mode.

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

 /**
  * High-fidelity audio programming in the browser.
  */
 library dart.dom.web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal';
 import 'dart:html';
 import 'dart:html_common';
@@ skipping 343 matching lines @@
 
   @DomName('AudioContext.createStereoPanner')
   @DocsEditable()
   @Experimental() // untriaged
   StereoPannerNode createStereoPanner() native;
 
   @DomName('AudioContext.createWaveShaper')
   @DocsEditable()
   WaveShaperNode createWaveShaper() native;
 
-  @JSName('decodeAudioData')
-  @DomName('AudioContext.decodeAudioData')
-  @DocsEditable()
-  Future _decodeAudioData(ByteBuffer audioData,
-      [AudioBufferCallback successCallback,
-      AudioBufferCallback errorCallback]) native;
-
   @DomName('AudioContext.resume')
   @DocsEditable()
   @Experimental() // untriaged
   Future resume() native;
 
   @DomName('AudioContext.suspend')
   @DocsEditable()
   @Experimental() // untriaged
   Future suspend() native;
 
@@ skipping 21 matching lines @@
           bufferSize, numberOfInputChannels, numberOfOutputChannels);
     } else if (numberOfInputChannels != null) {
       return JS('ScriptProcessorNode', '#.call(#, #, #)', function, this,
           bufferSize, numberOfInputChannels);
     } else {
       return JS(
           'ScriptProcessorNode', '#.call(#, #)', function, this, bufferSize);
     }
   }
 
+  @JSName('decodeAudioData')
+  @DomName('AudioContext.decodeAudioData')
+  @DocsEditable()
+  Future _decodeAudioData(ByteBuffer audioData,
+      [AudioBufferCallback successCallback,
+      AudioBufferCallback errorCallback]) native;
+
   @DomName('AudioContext.decodeAudioData')
   Future<AudioBuffer> decodeAudioData(ByteBuffer audioData) {
     var completer = new Completer<AudioBuffer>();
     _decodeAudioData(audioData, (value) {
       completer.complete(value);
     }, (error) {
       if (error == null) {
         completer.completeError('');
       } else {
         completer.completeError(error);
@@ skipping 725 matching lines @@
   }
 
   @DomName('WaveShaperNode.curve')
   @DocsEditable()
   Float32List curve;
 
   @DomName('WaveShaperNode.oversample')
   @DocsEditable()
   String oversample;
 }