Make the externally connectable browser test clobber all of the builtins,

chrome/renderer/extensions/safe_builtins.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_SAFE_BUILTINS_H_
 #define CHROME_RENDERER_EXTENSIONS_SAFE_BUILTINS_H_
 
 #include "v8/include/v8.h"
 
 namespace extensions {
@@ skipping 15 matching lines @@
   //
   // Examples:
   //   Array.prototype.forEach.call(...) becomes Array.forEach(...)
   //   Object.prototype.toString.call(...) becomes Object.toString(...)
   //   Object.keys.call(...) becomes Object.keys(...)
   v8::Local<v8::Object> GetArray() const;
   v8::Local<v8::Object> GetFunction() const;
   // NOTE(kalman): VS2010 won't compile "GetObject", it mysteriously renames it
   // to "GetObjectW" - hence GetObjekt. Sorry.
   v8::Local<v8::Object> GetObjekt() const;
+  v8::Local<v8::Object> GetRegExp() const;
+  v8::Local<v8::Object> GetString() const;
 
  private:
   ChromeV8Context* context_;
 };
 
 } //  namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_SAFE_BUILTINS_H_