MD Settings: Fix internet focus and styling

ui/webui/resources/cr_elements/shared_style_css.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_vars_css.html">
 
 <!-- Common styles for Material Design WebUI. Included directly in
   settings_shared_css.html. -->
 <dom-module id="cr-shared-style">
   <template>
     <style>
       /* Chrome spinners should be blue. */
       paper-spinner {
@@ skipping 23 matching lines @@
 
       .action-button,
       .cancel-button {
         font-weight: 500;
       }
 
       [actionable] {
         @apply(--cr-actionable);
       }
 
+      button[is='paper-icon-button-light'].subpage-arrow {
+        background-image: url(../images/arrow_right.svg);
+      }
+
+      button[is='paper-icon-button-light'].icon-external {
+        background-image: url(../images/open_in_new.svg);
+      }
+
+      .subpage-arrow,
+      .icon-external {
+        display: none;
+      }
+
+      [actionable] :-webkit-any(.subpage-arrow, .icon-external),
+      [actionable]:-webkit-any(.subpage-arrow, .icon-external) {
+        display: block;
+      }
+
       [scrollable] {
         border-color: transparent;
         border-style: solid;
         border-width: 1px 0;
         overflow-y: auto;
       }
       [scrollable].is-scrolled {
         border-top-color: var(--google-grey-300);
       }
       [scrollable].can-scroll:not(.scrolled-to-bottom) {
@@ skipping 16 matching lines @@
       [selectable]:focus,
       [selectable] > :focus {
         @apply(--cr-selectable-focus);
       }
       [selectable] > * {
         @apply(--cr-actionable);
       }
     </style>
   </template>
 </dom-module>