Support overloaded constructors.

sdk/lib/web_audio/dartium/web_audio_dartium.dart

 library web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:collection-dev';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:nativewrappers';
 // DO NOT EDIT
 // Auto-generated dart:audio library.
@@ skipping 215 matching lines @@
 
 @DomName('AudioContext')
 class AudioContext extends EventTarget {
   AudioContext.internal() : super.internal();
 
   @DomName('AudioContext.complete')
   @DocsEditable
   static const EventStreamProvider<Event> completeEvent = const EventStreamProvider<Event>('complete');
 
   @DocsEditable
-  factory AudioContext() => AudioContext._create();
-  static AudioContext _create() native "AudioContext_constructor_Callback";
+  factory AudioContext() {
+    return AudioContext._create_1();
+  }
+  static AudioContext _create_1() native "AudioContext_create_1_constructor_Callback";
 
   @DocsEditable
   @DomName('EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent')
   @deprecated
   AudioContextEvents get on =>
     new AudioContextEvents(this);
 
   @DomName('AudioContext.activeSourceCount')
   @DocsEditable
   int get activeSourceCount native "AudioContext_activeSourceCount_Getter";
@@ skipping 650 matching lines @@
 
 // WARNING: Do not edit - generated code.
 
 
 @DocsEditable
 @DomName('OfflineAudioContext')
 class OfflineAudioContext extends AudioContext implements EventTarget {
   OfflineAudioContext.internal() : super.internal();
 
   @DocsEditable
-  factory OfflineAudioContext(int numberOfChannels, int numberOfFrames, num sampleRate) => OfflineAudioContext._create(numberOfChannels, numberOfFrames, sampleRate);
-  static OfflineAudioContext _create(int numberOfChannels, int numberOfFrames, num sampleRate) native "OfflineAudioContext_constructor_Callback";
+  factory OfflineAudioContext(int numberOfChannels, int numberOfFrames, num sampleRate) {
+    return OfflineAudioContext._create_1(numberOfChannels, numberOfFrames, sampleRate);
+  }
+  static OfflineAudioContext _create_1(numberOfChannels, numberOfFrames, sampleRate) native "OfflineAudioContext_create_1_constructor_Callback";
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 
 @DocsEditable
@@ skipping 197 matching lines @@
 
 // WARNING: Do not edit - generated code.
 
 
 @DocsEditable
 @DomName('WaveTable')
 class WaveTable extends NativeFieldWrapperClass1 {
   WaveTable.internal();
 
 }