Hotword Audio Verification App: UI polishes.

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

 <div id="speech-training-container" hidden>
   <div class="mic"></div>
   <div class="container">
     <div class="header">
-      <span class="close"></span>
+      <span id="st-close-button" class="speech-close"></span>

[Dan Beam, 2014/10/23 23:56:01]

s/st/speech-training/g

[kcarattini, 2014/10/24 07:02:42]

see above.

       <div class="header-text">
         <div class="v-spacing-for-no-subheading"></div>
         <h1>Let's train your Chromebook</h1>
       </div>
     </div>
     <div id="st-training" class="content">
       <div class="col-2">
         To help Google respond to you and for reliable and easy access to
         voice search, you need to teach Google the sound of your voice.
         <br>
         <h4>Just say 'Ok Google' three times</h4>
       </div>
       <div class="col-spacing"></div>
       <div class="col-2">
-        <div class="train listening">
+        <div id="st-train-1" class="train listening">
           <span class="icon"></span>
-          <span class="text">Say 'Ok Google'</span>
+          <span id="st-train-text-1" class="text">Say 'Ok Google'</span>
         </div>
-        <div class="train not-started">
+        <div id="st-train-2" class="train not-started">
           <span class="icon"></span>
-          <span class="text">Say 'Ok Google' again</span>
+          <span id="st-train-text-2" class="text">Say 'Ok Google' again</span>
         </div>
-        <div class="train not-started">
+        <div id="st-train-3" class="train not-started">
           <span class="icon"></span>
-          <span class="text">Say 'Ok Google' one last time</span>
+          <span id="st-train-text-3"
+              class="text">Say 'Ok Google' one last time</span>
         </div>
       </div>
     </div>
     <div class="buttonbar">
       <button id="st-cancel-button">CANCEL</button>
     </div>
   </div>
 </div>