Fix sound not playing in Dartium checked mode.

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

Index: sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
diff --git a/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart b/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
index e725018213e282ed76cd734b76a08d23580a7e7d..73493c5c6e0178cdfd45721374616e6d210555f5 100644
--- a/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
+++ b/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
@@ -361,13 +361,6 @@ class AudioContext extends EventTarget {
   @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
@@ -409,6 +402,13 @@ class AudioContext extends EventTarget {
     }
   }
 
+  @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>();