MD Settings: fix "Add search engine" link regression

chrome/browser/resources/settings/settings_shared_css.html

 /* 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. */
 
 /**
  * @fileoverview
  * Common styles for Material Design settings.
  */
 
 <dom-module id="settings-shared">
@@ skipping 23 matching lines @@
       }
 
       paper-button[toggles][active] {
         background-color: LightGray;
       }
 
       span ~ a {
         -webkit-margin-start: 4px;
       }
 
+      [is='action-link'],
+      [is='action-link']:active,
+      [is='action-link']:hover,
+      [is='action-link']:visited,
+      paper-button.primary-button {
+        /* TODO(dbeam): change all other colors in this file into --google or
+         * --paper where applicable. */
+        color: var(--google-blue-700);
+      }
+
+      [is='action-link']:hover {
+        /* TODO(dbeam): check with bettes@ on this one, but I'm pretty sure we
+         * shouldn't be showing much :hover stuff on Polymer pages. */
+        text-decoration: none;
+      }
+
       paper-button.primary-button {
         --paper-button: {
-          color: rgb(66, 133, 244);
           font-weight: 500;
           text-align: start;
         };
         margin: 0 -0.57em;  /* Offsets default paper-button padding. */
       }
 
       paper-button.secondary-button {
         --paper-button: {
           color: #5a5a5a;
           text-decoration: none;
@@ skipping 162 matching lines @@
       .vertical-list > div:first-of-type {
         border-top: none;
       }
 
       .vertical-list > div {
         border-top: 1px solid var(--paper-grey-300);
       }
     </style>
   </template>
 </dom-module>