Migrate to Chrome 37 IDL

tools/dom/templates/html/dartium/html_dartium.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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 /**
  * HTML elements and other resources for web-based applications that need to
  * interact with the browser and the DOM (Document Object Model).
@@ skipping 131 matching lines @@
 final htmlBlinkMap = {
   '_HistoryCrossFrame': () => _HistoryCrossFrame,
   '_LocationCrossFrame': () => _LocationCrossFrame,
   '_DOMWindowCrossFrame': () => _DOMWindowCrossFrame,
   // FIXME: Move these to better locations.
   'DateTime': () => DateTime,
   'JsObject': () => js.JsObject,
   'JsFunction': () => js.JsFunction,
   'JsArray': () => js.JsArray,
 $!TYPE_MAP
-  // FIXME: Temporary workaround.  The Blink name matches the Dart name
-  // post Chrome 35.  We still generate the old mapping from 'Clipboard'.
-  'DataTransfer': () => DataTransfer,
 };
 
 // TODO(leafp): We may want to move this elsewhere if html becomes
 // a package to avoid dartium depending on pkg:html.
 Type _getType(String key) {
   var result;
 
   // TODO(vsm): Add Cross Frame and JS types here as well.
 
   // Check the html library.
@@ skipping 69 matching lines @@
   }
   return null;
 }
 
 Type _getSvgType(String key) {
   if (svgBlinkMap.containsKey(key)) {
     return svgBlinkMap[key]();
   }
   return null;
 }