MD Settings: fix incorrect behavior with Enter on bluetooth item's icon-button.

chrome/browser/resources/settings/bluetooth_page/bluetooth_device_list_item.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_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-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="bluetooth-device-list-item">
@@ skipping 16 matching lines @@
         </div>
         <div class="state secondary" connected$="[[device.connected]]"
             hidden$="[[!hasConnectionStatusText_(device)]]">
           [[getConnectionStatusText_(device)]]
         </div>
       </div>
       <span hidden$="[[!device.connecting]]">$i18n{bluetoothConnecting}</span>
       <div hidden$="[[!device.paired]]">
         <button is="paper-icon-button-light" class="icon-more-vert"
             on-tap="onMenuButtonTap_" tabindex$="[[tabindex]]"
-            title="$i18n{moreActions}">
+            title="$i18n{moreActions}" on-keydown="ignoreEnterKey_">
         </button>
         <dialog id="dotsMenu" is="cr-action-menu">
           <button class="dropdown-item" role="option"
               on-tap="onConnectActionTap_">
             [[getConnectActionText_(device.connected)]]
           </button>
           <button class="dropdown-item" role="option" on-tap="onRemoveTap_">
             $i18n{bluetoothRemove}
           </button>
         </dialog>
       </div>
     </div>
   </template>
   <script src="bluetooth_device_list_item.js"></script>
 </dom-module>