oobe: unused code cleanup

Bug: 1143666
Change-Id: I17ea892172fd2cad26cf711f4313b7385c1de4eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529551Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#825881}

chrome/browser/resources/chromeos/login/components/oobe_dialog.css

@@ -120,10 +120,6 @@
   z-index: 1;
 }
 
-#buttons-overlay {
-  background: rgba(var(--google-grey-900-rgb), 0.6);
-}
-
 :host #oobe-bottom[no-buttons-padding] {
   padding: unset;
 }

chrome/browser/resources/chromeos/login/components/oobe_dialog.js

@@ -128,9 +128,6 @@ Polymer({
   onBeforeShow() {
     this.$$('#lazy').get();
     this.observeScrolling_();
-    var isOobe = window.hasOwnProperty('Oobe') &&
-        window.hasOwnProperty('DISPLAY_TYPE') && Oobe.getInstance() &&
-        Oobe.getInstance().displayType == DISPLAY_TYPE.OOBE;
   },
 
   /**