Fixes for Chrome 34 merge

tools/dom/src/native_DOMImplementation.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 html;
 
 class _ConsoleVariables {
   Map<String, Object> _data = new Map<String, Object>();
 
   /**
@@ skipping 128 matching lines @@
   }
 
   static _ConsoleVariables _consoleTempVariables = new _ConsoleVariables();
 
   /**
    * Header passed in from the Dartium Developer Tools when an expression is
    * evaluated in the console as opposed to the watch window or another context
    * that does not expect REPL support.
    */
   static const _CONSOLE_API_SUPPORT_HEADER =
-      'with ((console && console._commandLineAPI) || {}) {\n';
-
+      'with ((console && console._commandLineAPI) || { __proto__: null }) {\n';
   static bool expectsConsoleApi(String expression) {
     return expression.indexOf(_CONSOLE_API_SUPPORT_HEADER) == 0;;
   }
 
   /**
    * Takes an [expression] and a list of [local] variable and returns an
    * expression for a closure with a body matching the original expression
    * where locals are passed in as arguments. Returns a list containing the
    * String expression for the closure and the list of arguments that should
    * be passed to it. The expression should then be evaluated using
@@ skipping 469 matching lines @@
   _scheduleImmediateHelper._schedule(callback);
 };
 
 get _pureIsolateScheduleImmediateClosure => ((void callback()) =>
   throw new UnimplementedError("scheduleMicrotask in background isolates "
                                "are not supported in the browser"));
 
 void _initializeCustomElement(Element e) {
   _Utils.initializeCustomElement(e);
 }