Adds the page for hotword-only to the opt-in flow.

chrome/browser/resources/hotword_audio_verification/steps/finished_step.html

 <div id="finished-container" hidden>
   <div class="container">
     <div class="header">
       <span class="close"></span>
       <div class="header-text">
         <div class="v-spacing-for-no-subheading"></div>
         <h1>All set!</h1>
       </div>
     </div>
     <div class="content">
       <div class="col-3">
         <h4>Your Chromebook can now:</h4>
         <div class="check">
           <span class="icon"></span>
           <span class="text">
             Recognize your voice when you say 'Ok Google'
           </span>
         </div>
         <div class="check">
           <span class="icon"></span>
           <span class="text">
             Respond to 'Ok Google' when the screen is on
           </span>
         </div>
         You can change these settings at any time in the
         <a href="#">Chrome Settings</a>
       </div>
     </div>
     <div class="buttonbar">
-      <button id="try-now-button" class="primary">OK, TRY IT NOW</button>
+      <button id="done-button" class="primary">DONE</button>
     </div>
   </div>
 </div>