Site Settings Desktop: Show menu right-aligned.

chrome/browser/resources/settings/site_settings/site_list.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-submenu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu-button/paper-menu-button.html">
 <link rel="import" href="/i18n_setup.html">
@@ skipping 40 matching lines @@
                 <div class="selectable">[[item.originForDisplay]]</div>
                 <div class="selectable secondary">
                   [[item.embeddingOriginForDisplay]]
                 </div>
               </div>
             </div>
 
             <template is="dom-if" if="[[isPolicyControlled_(item.source)]]">
               <iron-icon icon="cr:domain"></iron-icon>
             </template>
-            <paper-menu-button hidden="[[!shouldShowMenu_(item.source)]]">
+            <paper-menu-button hidden="[[!shouldShowMenu_(item.source)]]"
+                horizontal-align="right">
               <paper-icon-button icon="cr:more-vert" class="dropdown-trigger">
               </paper-icon-button>
               <paper-menu id="actionMenu" class="dropdown-content"
                   on-iron-activate="onActionMenuIronActivate_"
                   attr-for-selected="menu-value">
                 <paper-item
                     hidden="[[!showAllowAction_]]"
                     menu-value$="[[PermissionValues.ALLOW]]">
                   $i18n{siteSettingsActionAllow}
                 </paper-item>
@@ skipping 19 matching lines @@
         <template is="dom-if" if="[[!allSites]]">
           <div class="list-item list-button" on-tap="onAddSiteTap_">
             $i18n{addSiteLink}
           </div>
         </template>
       </div>
     </paper-submenu>
   </template>
   <script src="site_list.js"></script>
 </dom-module>