Move extensions bindings code out of //chrome

chrome/renderer/extensions/file_system_natives.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_EXTENSIONS_FILE_SYSTEM_NATIVES_H_
-#define CHROME_RENDERER_EXTENSIONS_FILE_SYSTEM_NATIVES_H_
-
-#include "base/compiler_specific.h"
-#include "extensions/renderer/object_backed_native_handler.h"
-
-namespace extensions {
-class ChromeV8Context;
-
-// Custom bindings for the nativeFileSystem API.
-class FileSystemNatives : public ObjectBackedNativeHandler {
- public:
-  explicit FileSystemNatives(ChromeV8Context* context);
-
- private:
-  void GetFileEntry(const v8::FunctionCallbackInfo<v8::Value>& args);
-  void GetIsolatedFileSystem(const v8::FunctionCallbackInfo<v8::Value>& args);
-  void CrackIsolatedFileSystemName(
-      const v8::FunctionCallbackInfo<v8::Value>& args);
-  // Constructs a DOMError object to be used in JavaScript.
-  void GetDOMError(const v8::FunctionCallbackInfo<v8::Value>& args);
-
-  DISALLOW_COPY_AND_ASSIGN(FileSystemNatives);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_RENDERER_EXTENSIONS_FILE_SYSTEM_NATIVES_H_