Renaming dart:html library from 'html' to 'dart.html'

tools/dom/templates/html/impl/impl_Event.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.
 
 // WARNING: Do not edit - generated code.
 
-part of html;
+part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   // In JS, canBubble and cancelable are technically required parameters to
   // init*Event. In practice, though, if they aren't provided they simply
   // default to false (since that's Boolean(undefined)).
   //
   // Contrary to JS, we default canBubble and cancelable to true, since that's
   // what people want most of the time anyway.
   factory $CLASSNAME(String type,
       {bool canBubble: true, bool cancelable: true}) {
@@ skipping 22 matching lines @@
    */
   static bool _isTypeSupported(String eventType) {
     // Browsers throw for unsupported event names.
     try {
       var e = document.$dom_createEvent(eventType);
       return e is Event;
     } catch (_) { }
     return false;
   }
 }