MD Settings: Replace language detail page with dropdown menu items

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">
       /* Use <h2> as the "sub-header" mentioned in the UX design docs. */
       h2 {
         align-items: center;
@@ skipping 41 matching lines @@
       iron-dropdown .dropdown-content,
       paper-dropdown-menu-light paper-listbox {
         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%;
       }
 
       paper-dropdown-menu-light .dropdown-item.iron-selected {
@@ skipping 311 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>