Remove reference to non-existant div in Printers settings

This change removes the reference in onAddPrinterTap_ to
addPrinterErrorMessage which was removed in https://crrev.com/c/1060341.

Bug: chromium:848055
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I5084eac9896331c71c58a9cac2851d1ce14f56ec
Reviewed-on: https://chromium-review.googlesource.com/1089207
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566639}

chrome/browser/resources/settings/printing_page/cups_printers.html

@@ -22,16 +22,6 @@
         margin-top: 80px;
         text-align: center;
       }
-
-      #addPrinterErrorMessage {
-        display: flex;
-        justify-content: space-around;
-      }
-
-      #addPrinterFailedMessage {
-        padding: 0 15px;
-        text-align: justify;
-      }
     </style>
 
     <div class="settings-box first">

chrome/browser/resources/settings/printing_page/cups_printers.js

@@ -175,7 +175,6 @@ Polymer({
   /** @private */
   onAddPrinterTap_: function() {
     this.$.addPrinterDialog.open();
-    this.$.addPrinterErrorMessage.hidden = true;
   },
 
   /** @private */