Hotword Audio Verification App: Fix window handling.

chrome/browser/resources/hotword_audio_verification/flow.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function() {
 
   // Correspond to steps in the hotword opt-in flow.
   /** @const */ var HOTWORD_AUDIO_HISTORY = 'hotword-audio-history-container';
   /** @const */ var HOTWORD_ONLY_START = 'hotword-only-container';
   /** @const */ var AUDIO_HISTORY_START = 'audio-history-container';
@@ skipping 55 matching lines @@
     this.advanceStep();
   };
 
   /**
    * Displays the current step. If the current step is not the first step,
    * also hides the previous step.
    * @private
    */
   Flow.prototype.showStep_ = function() {
     var currentStep = this.currentFlow_[this.currentStepIndex_];
+    document.getElementById(currentStep).hidden = false;
+
     var previousStep = null;
     if (this.currentStepIndex_ > 0)
       previousStep = this.currentFlow_[this.currentStepIndex_ - 1];
 
     if (previousStep)
       document.getElementById(previousStep).hidden = true;
 
-    document.getElementById(currentStep).hidden = false;
+    chrome.app.window.current().show();
   };
 
   window.Flow = Flow;
 })();