Revert of EasyUnlock: Work around the ghost overlay from CSS animation....

Revert of EasyUnlock: Work around the ghost overlay from CSS animation. (patchset #3 id:40001 of https://codereview.chromium.org/487373002/)

Reason for revert:
No longer needed since underlying blink issue http://crbug.com/405250 is fixed.

Original issue's description:
> EasyUnlock: Work around the ghost overlay from CSS animation.
>
> BUG=404779
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290743

TBR=tbarzic@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404779

Review URL: https://codereview.chromium.org/521343002

Cr-Commit-Position: refs/heads/master@{#292816}

chrome/browser/resources/options/easy_unlock_turn_off_overlay.js

@@ -92,13 +92,6 @@ cr.define('options', function() {
       chrome.send('easyUnlockTurnOffOverlayDismissed');
     },
 
-    /** @override */
-    handleCancel: function() {
-      // Make sure keyboard dismiss uses the word around as well.
-      // TODO(xiyuan): Remove the workaround. See http://crbug.com/405250
-      EasyUnlockTurnOffOverlay.dismiss();
-    },
-
     /**
      * Returns the button strip element.
      * @return {HTMLDivElement} The container div of action buttons.
@@ -182,12 +175,7 @@ cr.define('options', function() {
    * Closes the Easy unlock turn off overlay.
    */
   EasyUnlockTurnOffOverlay.dismiss = function() {
-    // TODO(xiyuan): Remove the workaround and call closeOverly directly.
-    // See http://crbug.com/405250
-    $('easy-unlock-turn-off-spinner').hidden = true;
-    window.setTimeout(function() {
-      PageManager.closeOverlay();
-    }, 100);
+    PageManager.closeOverlay();
   };
 
   /**