Creating a new directory chrome/renderer/searchbox and moving appropriate code to it.

chrome/renderer/searchbox_extension.h

-// Copyright (c) 2012 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_SEARCHBOX_EXTENSION_H_
-#define CHROME_RENDERER_SEARCHBOX_EXTENSION_H_
-
-#include "base/basictypes.h"
-
-namespace v8 {
-class Extension;
-}
-
-namespace WebKit {
-class WebFrame;
-}
-
-namespace extensions_v8 {
-
-// Reference implementation of the SearchBox API as described in:
-// http://dev.chromium.org/searchbox
-class SearchBoxExtension {
- public:
-  // Returns the v8::Extension object handling searchbox bindings. Returns null
-  // if match-preview is not enabled. Caller takes ownership of returned object.
-  static v8::Extension* Get();
-
-  static void DispatchChange(WebKit::WebFrame* frame);
-  static void DispatchSubmit(WebKit::WebFrame* frame);
-  static void DispatchCancel(WebKit::WebFrame* frame);
-  static void DispatchResize(WebKit::WebFrame* frame);
-
-  static bool PageSupportsInstant(WebKit::WebFrame* frame);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SearchBoxExtension);
-};
-
-}  // namespace extensions_v8
-
-#endif  // CHROME_RENDERER_SEARCHBOX_EXTENSION_H_