Stop ChromeVox Next page loading sounds when page finishes loading.

chrome/browser/resources/chromeos/chromevox/cvox2/background/next_earcons.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview Earcons library that uses EarconEngine to play back
  * auditory cues.
  */
 
 
@@ skipping 72 matching lines @@
       case cvox.Earcon.OBJECT_EXIT:
       case cvox.Earcon.OBJECT_OPEN:
       case cvox.Earcon.OBJECT_SELECT:
         // TODO(dmazzoni): decide if we want new earcons for these
         // or not. We may choose to not have earcons for some of these.
         break;
       case cvox.Earcon.PAGE_FINISH_LOADING:
         this.engine_.cancelProgress();
         break;
       case cvox.Earcon.PAGE_START_LOADING:
-        // TODO(dmazzoni): only when the page has focus.
         this.engine_.startProgress();
         break;
       case cvox.Earcon.POP_UP_BUTTON:
         this.engine_.onPopUpButton();
         break;
       case cvox.Earcon.RECOVER_FOCUS:
         // TODO(dmazzoni): decide if we want new earcons for this.
         break;
       case cvox.Earcon.SELECTION:
         this.engine_.onSelection();
         break;
       case cvox.Earcon.SELECTION_REVERSE:
         this.engine_.onSelectionReverse();
         break;
       case cvox.Earcon.SKIP:
         this.engine_.onSkim();
         break;
       case cvox.Earcon.SLIDER:
         this.engine_.onSlider();
         break;
       case cvox.Earcon.WRAP:
       case cvox.Earcon.WRAP_EDGE:
         this.engine_.onWrap();
         break;
     }
-  }
+  },
+
+  /**
+   * @override
+   */
+  cancelEarcon: function(earcon) {
+    switch (earcon) {
+      case cvox.Earcon.PAGE_START_LOADING:
+        this.engine_.cancelProgress();
+        break;
+    }
+  },
 };