MD History: Replace last usage of cr-shared-menu with cr-action-menu.

chrome/browser/resources/settings/settings_shared_css.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="/settings_vars_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       /* Included here so we don't have to include "iron-positioning" in every
        * stylesheet. See crbug.com/498405. */
       [hidden] {
@@ skipping 39 matching lines @@
         @apply(--settings-actionable);
         height: var(--settings-row-min-height);
         width: 31px;
       }
 
       iron-dropdown .dropdown-content {
         min-width: 128px;
         padding: 8px 0;
       }
 
-      .dropdown-item {
-        align-items: center;
-        background: none;
-        border: none;
-        box-sizing: border-box;
-        color: var(--paper-grey-800);
-        display: flex;
-        font: inherit;
-        min-height: 32px;
-        padding: 0 24px;
-        text-align: start;
-        width: 100%;
-      }
-
       iron-dropdown .dropdown-item:focus {
         @apply(--cr-selectable-focus);
       }
 
       iron-dropdown .dropdown-content {
         background-color: white;
         box-shadow: 0 2px 6px var(--paper-grey-500);
       }
 
-      .dropdown-item:not([disabled]),
       iron-dropdown .dropdown-content paper-item {
         @apply(--settings-actionable);
       }
 
-      iron-dropdown .dropdown-content .dropdown-item[disabled],
-      cr-shared-menu .dropdown-item[disabled] {
+      iron-dropdown .dropdown-content .dropdown-item[disabled] {
         opacity: var(--settings-disabled-opacity);
       }
 
       span ~ a {
         -webkit-margin-start: 4px;
       }
 
       [is='action-link'],
       [is='action-link']:active,
       [is='action-link']:hover,
@@ skipping 299 matching lines @@
       /* Turns the arrow direction downwards, when the bubble is placed above
        * the anchor element */
       .search-bubble-innards.above::after {
         -webkit-transform: rotate(-135deg);
         bottom: -5px;
         top: auto;
       }
     </style>
   </template>
 </dom-module>