[Extensions] Clean up the handling of ExtensionHostMsg_Request

chrome/browser/extensions/api/bookmarks/bookmarks_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.
 
 #include "chrome/browser/extensions/api/bookmarks/bookmarks_api.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/i18n/time_formatting.h"
@@ skipping 756 matching lines @@
 void BookmarksIOFunction::ShowSelectFileDialog(
     ui::SelectFileDialog::Type type,
     const base::FilePath& default_path) {
   if (!dispatcher())
     return;  // Extension was unloaded.
 
   // Balanced in one of the three callbacks of SelectFileDialog:
   // either FileSelectionCanceled, MultiFilesSelected, or FileSelected
   AddRef();
 
-  WebContents* web_contents = dispatcher()->delegate()->
-      GetAssociatedWebContents();
+  WebContents* web_contents = GetAssociatedWebContents();
 
   select_file_dialog_ = ui::SelectFileDialog::Create(
       this, new ChromeSelectFilePolicy(web_contents));
   ui::SelectFileDialog::FileTypeInfo file_type_info;
   file_type_info.extensions.resize(1);
   file_type_info.extensions[0].push_back(FILE_PATH_LITERAL("html"));
   gfx::NativeWindow owning_window = web_contents ?
       platform_util::GetTopLevel(web_contents->GetNativeView())
           : NULL;
 #if defined(OS_WIN)
@@ skipping 55 matching lines @@
 }
 
 void BookmarksExportFunction::FileSelected(const base::FilePath& path,
                                            int index,
                                            void* params) {
   bookmark_html_writer::WriteBookmarks(GetProfile(), path, NULL);
   Release();  // Balanced in BookmarksIOFunction::SelectFile()
 }
 
 }  // namespace extensions