Remove unused printer subtext ARIA labels for CUPS printers

-The subtext variable/location on the CUPS printer page is intended to
 hold supplementary information for printers show on screen, but right
 now it is unused. Therefore, having aria-describedby="printerSubtext"
 gives no further context while unintentionally stopping the tooltip
 from being read by ChromeVox. So I will remove these references now
 then revisit these ARIA labels once we understand what the printer
 subtext will be.

Fixed: 1014145
Change-Id: I481a018a5d7e75f4f8ac28e6c60262fefa9805a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930695Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720637}

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

@@ -24,24 +24,21 @@
       </div>
       <template is="dom-if" if="[[isSavedPrinter_(printerEntry.printerType)]]">
         <cr-icon-button class="icon-more-vert" on-click="onOpenActionMenuTap_"
-            title="$i18n{moreActions}" aria-labelledby="printerName"
-            aria-describedby="printerSubtext">
+            title="$i18n{moreActions}" aria-labelledby="printerName">
         </cr-icon-button>
       </template>
       <template is="dom-if"
           if="[[isDiscoveredPrinter_(printerEntry.printerType)]]">
         <cr-button id="setupPrinterButton"
             on-click="onAddDiscoveredPrinterTap_"
-            aria-label$="[[getSetupButtonAria_()]]"
-            aria-describedby="printerSubtext">
+            aria-label$="[[getSetupButtonAria_()]]">
           $i18n{setupPrinter}
         </cr-button>
       </template>
       <template is="dom-if"
           if="[[isAutomaticPrinter_(printerEntry.printerType)]]">
         <cr-button id="savePrinterButton" on-click="onAddAutomaticPrinterTap_"
-            aria-label$="[[getSaveButtonAria_()]]"
-            aria-describedby="printerSubtext">
+            aria-label$="[[getSaveButtonAria_()]]">
           $i18n{savePrinter}
         </cr-button>
       </template>

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

@@ -15,7 +15,7 @@ Polymer({
 
     /**
      * TODO(jimmyxgong): Determine how subtext should be set and what
-     * information it should have.
+     * information it should have, including necessary ARIA labeling
      * The additional information subtext for a printer.
      * @type {string}
      */