Fix for crash when attaching a frame in WebUI renderer.

content/renderer/chrome_object_extensions_utils.h

+// Copyright (c) 2014 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 CONTENT_RENDERER_CHROME_OBJECT_EXTENSIONS_UTILS_H_
+#define CONTENT_RENDERER_CHROME_OBJECT_EXTENSIONS_UTILS_H_
+
+#include "v8/include/v8.h"
+
+namespace content {
+
+v8::Handle<v8::Object> GetOrCreateChromeObject(
+    v8::Isolate* isolate, v8::Handle<v8::Object> global);
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_CHROME_OBJECT_EXTENSIONS_UTILS_H_