Drive extension functions from ExtensionFunction::Run. The

chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api.cc

 // 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.
 
 // The file contains the implementation of
 // fileBrowserHandlerInternal.selectFile extension function.
 // When invoked, the function does the following:
 //  - Verifies that the extension function was invoked as a result of user
 //    gesture.
 //  - Display 'save as' dialog using FileSelectorImpl which waits for the user
@@ skipping 266 matching lines @@
         FileSelectorFactory* file_selector_factory,
         bool enable_user_gesture_check)
         : file_selector_factory_(file_selector_factory),
           user_gesture_check_enabled_(enable_user_gesture_check) {
   DCHECK(file_selector_factory);
 }
 
 FileBrowserHandlerInternalSelectFileFunction::
     ~FileBrowserHandlerInternalSelectFileFunction() {}
 
-bool FileBrowserHandlerInternalSelectFileFunction::RunImpl() {
+bool FileBrowserHandlerInternalSelectFileFunction::RunAsync() {
   scoped_ptr<SelectFile::Params> params(SelectFile::Params::Create(*args_));
 
   base::FilePath suggested_name(params->selection_params.suggested_name);
   std::vector<std::string> allowed_extensions;
   if (params->selection_params.allowed_file_extensions.get())
     allowed_extensions = *params->selection_params.allowed_file_extensions;
 
   if (!user_gesture() && user_gesture_check_enabled_) {
     SetError(kNoUserGestureError);
     return false;
@@ skipping 67 matching lines @@
     result->entry->file_system_name = entry_definition.file_system_name;
     result->entry->file_system_root = entry_definition.file_system_root_url;
     result->entry->file_full_path =
         "/" + entry_definition.full_path.AsUTF8Unsafe();
     result->entry->file_is_directory = entry_definition.is_directory;
   }
 
   results_ = SelectFile::Results::Create(*result);
   SendResponse(true);
 }