[Extensions] Add more bindings access checks

chrome/renderer/extensions/file_browser_handler_custom_bindings.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_BROWSER_HANDLER_CUSTOM_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_FILE_BROWSER_HANDLER_CUSTOM_BINDINGS_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "extensions/renderer/object_backed_native_handler.h"
 
 namespace extensions {
 
 // Custom bindings for the fileBrowserHandler API.
 class FileBrowserHandlerCustomBindings : public ObjectBackedNativeHandler {
  public:
   explicit FileBrowserHandlerCustomBindings(ScriptContext* context);
 
+  // Public static implementation of GetExternalFileEntry() for use by
+  // FileManagerPrivate native handler.
+  static void GetExternalFileEntry(
+      const v8::FunctionCallbackInfo<v8::Value>& args,
+      ScriptContext* context);
+
  private:
-  void GetExternalFileEntry(const v8::FunctionCallbackInfo<v8::Value>& args);
-  void GetEntryURL(const v8::FunctionCallbackInfo<v8::Value>& args);
+  void GetExternalFileEntryCallback(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
 
   DISALLOW_COPY_AND_ASSIGN(FileBrowserHandlerCustomBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_FILE_BROWSER_HANDLER_CUSTOM_BINDINGS_H_