Removing deprecated events syntax.

sdk/lib/web_audio/dartium/web_audio_dartium.dart

Index: sdk/lib/web_audio/dartium/web_audio_dartium.dart
diff --git a/sdk/lib/web_audio/dartium/web_audio_dartium.dart b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
index 765c957b03f1ecae8a6fc8acd3d99163627b9522..23ad0a3923d14d4d1bef9218d8e689ce0b7050f6 100644
--- a/sdk/lib/web_audio/dartium/web_audio_dartium.dart
+++ b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
@@ -235,12 +235,6 @@ class AudioContext extends EventTarget {
   @DocsEditable
   static AudioContext _create() native "AudioContext_constructorCallback";
 
-  @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";
@@ -411,16 +405,6 @@ class AudioContext extends EventTarget {
   Stream<Event> get onComplete => completeEvent.forTarget(this);
 
 }
-
-@DocsEditable
-@deprecated
-class AudioContextEvents extends Events {
-  @DocsEditable
-  AudioContextEvents(EventTarget _ptr) : super(_ptr);
-
-  @DocsEditable
-  EventListenerList get complete => this['complete'];
-}
 // 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.