Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/dart2js/impl_AudioBufferSourceNode.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)$(NATIVESPEC)class $CLASSNAME$EXTENDS$IMPLEMENTS {
 
   // TODO(efortuna): Remove these methods when Chrome stable also uses start
   // instead of noteOn.
   void start(num when, [num grainOffset, num grainDuration]) {
     if (JS('bool', '!!#.start', this)) {
       if (grainDuration != null) {
         JS('void', '#.start(#, #, #)', this, when, grainOffset, grainDuration);
       } else if (grainOffset != null) {
         JS('void', '#.start(#, #)', this, when, grainOffset);
       } else {
@@ skipping 12 matching lines @@
 
   void stop(num when) {
     if (JS('bool', '!!#.stop', this)) {
       JS('void', '#.stop(#)', this, when);
     } else {
       JS('void', '#.noteOff(#)', this, when);
     }
   }
 $!MEMBERS
 }