[Mac] Remove unused ImportProgressDialog.xib and Panel.xib.

chrome/app/nibs/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/mac/rules.gni")
 
 assert(is_mac)
 
 translated_xibs = [
   "AppMenu.xib",
@@ skipping 19 matching lines @@
   "DownloadItem.xib",
   "DownloadShelf.xib",
   "ExtensionInstallPrompt.xib",
   "ExtensionInstallPromptNoWarnings.xib",
   "ExtensionInstallPromptWebstoreData.xib",
   "ExtensionInstalledBubble.xib",
   "FirstRunBubble.xib",
   "FirstRunDialog.xib",
   "HttpAuthLoginSheet.xib",
   "HungRendererDialog.xib",
-  "ImportProgressDialog.xib",
   "MainMenu.xib",
   "OneClickSigninBubble.xib",
   "OneClickSigninDialog.xib",
   "SaveAccessoryView.xib",
   "TaskManager.xib",
   "Toolbar.xib",
 ]
 
 untranslated_xibs = [
   "BookmarkBarFolderWindow.xib",
   "FindBar.xib",
   "GlobalErrorBubble.xib",
   "InfoBar.xib",
-  "Panel.xib",
 ]
 
 mac_xib_bundle_data("chrome_xibs") {
   sources = translated_xibs + untranslated_xibs
 }
 
 action("localizer_table") {
   script = "generate_localizer.py"
 
   sources = translated_xibs
   table_path = "$target_gen_dir/localizer_table.h"
   outputs = [
     table_path,
   ]
   args = [
     "--output_path",
     rebase_path(table_path, root_build_dir),
   ]
   if (!use_system_xcode) {
     args += [
       "--developer_dir",
       hermetic_xcode_path,
     ]
   }
   args += rebase_path(translated_xibs, root_build_dir)
 }