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

chrome/BUILD.gn

 # Copyright 2014 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/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//chrome/version.gni")
@@ skipping 555 matching lines @@
     output = "$root_gen_dir/repack/resources.pak"
   } else {
     output = "$root_out_dir/resources.pak"
   }
 }
 
 # GYP version: chrome/chrome_resources.gyp:browser_tests_pak
 repack("browser_tests_pak") {
   sources = [
     "$root_gen_dir/chrome/options_test_resources.pak",
+    "$root_gen_dir/chrome/webui_test_resources.pak",
   ]
   output = "$root_out_dir/browser_tests.pak"
   deps = [
     "//chrome/browser/resources:options_test_resources",
+    "//chrome/test/data:webui_test_resources",
   ]
 }
 
 # Collects per-locale grit files from many sources into global per-locale files.
 chrome_repack_locales("repack_locales_pack") {
   visibility = [ ":*" ]
 
   input_locales = locales
 
   if (is_mac) {
@@ skipping 299 matching lines @@
       rebase_path(chrome_binary, root_build_dir),
       rebase_path(symbol_file, root_build_dir),
     ]
 
     deps = [
       ":chrome",
       dump_syms_label,
     ]
   }
 }