Convert i18n_process.css to use /deep/ instead of ::shadow and add tests.

tools/gritsettings/resource_ids

 # 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.
 #
 # This file is used to assign starting resource ids for resources and strings
 # used by Chromium.  This is done to ensure that resource ids are unique
 # across all the grd files.  If you are adding a new grd file, please add
 # a new entry to this file.
 #
 # The first entry in the file, SRCDIR, is special: It is a relative path from
@@ skipping 117 matching lines @@
   },
   "devtools_resources.grd": {
     "includes": [22000],
   },
   "chrome/browser/resources/options_resources.grd": {
     "includes": [23000],
     "structures": [23200],
   },
   "chrome/browser/resources/options_test_resources.grd": {
     "includes": [23400],
-    "structures": [23450],
+    "structures": [23440],
+  },
+  "chrome/test/data/webui_test_resources.grd": {
+    "includes": [23480],
+    "structures": [23490],
   },
   "cloud_print/virtual_driver/win/install/virtual_driver_setup_resources.grd": {
     "messages": [23500],
     "includes": [23550],
   },
   "cloud_print/service/win/service_resources.grd": {
     "messages": [23600],
     "includes": [23700],
     "structures": [23750],
   },
@@ skipping 107 matching lines @@
   # These files don't need to reserve resource ids, but are listed here so that
   # translation scripts know of their existence.
   "android_webview/java/strings/android_webview_strings.grd": {},
   "chrome/android/java/strings/android_chrome_strings.grd": {},
   "content/public/android/java/strings/android_content_strings.grd": {},
   "ui/accessibility/extensions/strings/accessibility_extensions_strings.grd": {},
   "ui/android/java/strings/android_ui_strings.grd": {},
 
   # Resource ids starting at 31000 are reserved for projects built on Chromium.
 }