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

ui/webui/resources/js/webui_resource_test.js

 // Copyright 2013 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.
 
 /**
  * Tests that an observation matches the expected value.
  * @param {Object} expected The expected value.
  * @param {Object} observed The actual value.
  * @param {string=} opt_message Optional message to include with a test
  *     failure.
@@ skipping 125 matching lines @@
    * @type {Function}
    */
   var pendingTearDown = null;
 
   /**
    * Runs all functions starting with test and reports success or
    * failure of the test suite.
    */
   function runTests() {
     for (var name in window) {
-      if (typeof window[name] == 'function' && /^test/.test(name))
-        testCases.push(name);
+      try {
+        if (typeof window[name] == 'function' && /^test/.test(name))
+          testCases.push(name);
+      } catch(e) {
+        if (location.protocol == 'data:' && e.name == 'SecurityError') {
+          // Sometimes this file gets loaded as a data: URI. That causes issues
+          // when it touches window.caches or window.cookie.
+        } else {
+          throw e;
+        }
+      }
     }
     if (!testCases.length) {
       console.error('Failed to find test cases.');
       cleanTestRun = false;
     }
     try {
       if (window.setUpPage)
         window.setUpPage();
     } catch(err) {
       cleanTestRun = false;
@@ skipping 49 matching lines @@
  * @param {boolean} success Indicates if the test completed successfully.
  */
 function endTests(success) {
   domAutomationController.setAutomationId(1);
   domAutomationController.send(success ? 'SUCCESS' : 'FAILURE');
 }
 
 window.onerror = function() {
   endTests(false);
 };