Switch from DRT to content shell.

sdk/lib/_internal/compiler/implementation/lib/native_helper.dart

 // 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 _js_helper;
 
 String typeNameInChrome(obj) {
   String name = JS('String', "#.constructor.name", obj);
   return typeNameInWebKitCommon(name);
 }
@@ skipping 145 matching lines @@
 }
 
 /**
  * Returns the function to use to get the type name of an object.
  */
 Function getFunctionForTypeNameOf() {
   // If we're not in the browser, we're almost certainly running on v8.
   if (!identical(JS('String', 'typeof(navigator)'), 'object')) return typeNameInChrome;
 
   String userAgent = JS('String', "navigator.userAgent");
+  // TODO(antonm): remove a reference to DumpRenderTree.
   if (contains(userAgent, 'Chrome') || contains(userAgent, 'DumpRenderTree')) {
     return typeNameInChrome;
   } else if (contains(userAgent, 'Firefox')) {
     return typeNameInFirefox;
   } else if (contains(userAgent, 'MSIE')) {
     return typeNameInIE;
   } else if (contains(userAgent, 'Opera')) {
     return typeNameInOpera;
   } else if (contains(userAgent, 'AppleWebKit')) {
     // Chrome matches 'AppleWebKit' too, but we test for Chrome first, so this
@@ skipping 125 matching lines @@
   }
   var isLeaf =
       (leafTags != null) && JS('bool', '(#[#]) === true', leafTags, tag);
   if (isLeaf) {
     return makeDispatchRecord(interceptor, false, null);
   } else {
     var proto = JS('', 'Object.getPrototypeOf(#)', obj);
     return makeDispatchRecord(interceptor, proto, null);
   }
 }