Settings People Revamp: Fix Mange Profile empty name crash.

chrome/browser/resources/settings/people_page/manage_profile.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="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://md-settings/people_page/sync_private_api.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 
 <dom-module id="settings-manage-profile">
   <link rel="import" type="css" href="manage_profile.css">
   <template>
     <style include="settings-shared"></style>
     <div class="settings-box first">
       <paper-input value="{{profileName}}" pattern=".*\S.*" auto-validate
-          on-blur="onProfileNameChanged_">
+          required on-change="onProfileNameChanged_">
       </paper-input>
       <div id="availableIcons">
         <template is="dom-repeat" items="[[availableIconUrls]]">
           <paper-button toggles active="{{isActiveIcon_(item, profileIconUrl)}}"
               on-tap="onIconTap_" data-icon-url$="[[item]]">
             <img src="[[item]]">
           </paper-button>
         </template>
       </div>
     </div>
   </template>
   <script src="manage_profile.js"></script>
 </dom-module>