Local NTP: restore tab to <div>, <span> elements

I removed the tabindex in https://crrev.com/c/720917, but that meant
that it was no longer possible to tab to the span and div elements.

Bug: 774147
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic3c40b9b48b2daeb5a59eabfd9f679fc5a0c2e6f
Reviewed-on: https://chromium-review.googlesource.com/725288Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Chris Pickel <sfiera@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509744}

chrome/browser/resources/local_ntp/local_ntp.html

@@ -49,7 +49,7 @@
         <input id="fakebox-input" autocomplete="off" tabindex="-1" type="url"
             aria-hidden="true">
         <div id="fakebox-cursor"></div>
-        <div id="fakebox-microphone" hidden></div>
+        <div id="fakebox-microphone" tabindex="0" hidden></div>
       </div>
     </div>
     <div id="most-visited">
@@ -60,9 +60,9 @@
         <span id="mv-msg"></span>
         <!-- Links in the notification. -->
         <span id="mv-notice-links">
-          <span id="mv-undo"></span>
-          <span id="mv-restore"></span>
-          <div id="mv-notice-x"></div>
+          <span id="mv-undo" tabindex="0"></span>
+          <span id="mv-restore" tabindex="0"></span>
+          <div id="mv-notice-x" tabindex="0"></div>
         </span>
       </div>
     </div>