MD Settings: ignore modified key events in the profile avatar grid

ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector.html

 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="cr_profile_avatar_selector_grid.html">
 
 <dom-module id="cr-profile-avatar-selector">
   <template>
     <style>
       :host {
         --avatar-size: 48px;
@@ skipping 24 matching lines @@
         @apply(--avatar-selector-avatar);
       }
 
       #avatar-grid .avatar.iron-selected {
         border: 1px solid var(--google-blue-500);
 
         @apply(--avatar-selector-avatar-selected);
       }
     </style>
     <cr-profile-avatar-selector-grid id="avatar-grid"
-        selected="{{selectedAvatarUrl}}" attr-for-selected="data-avatar-url">
+        selected="{{selectedAvatarUrl}}" attr-for-selected="data-avatar-url"
+        ignore-modified-key-events="[[ignoreModifiedKeyEvents]]">
       <template is="dom-repeat" items="[[avatars]]">
         <paper-button class="avatar" data-avatar-url$="[[item.url]]"
             title="[[item.label]]"
             style$="background-image: [[getIconImageset_(item.url)]]">
         </paper-button>
       </template>
     </cr-profile-avatar-selector-grid>
   </template>
   <script src="cr_profile_avatar_selector.js"></script>
 </dom-module>