Reduce Add Connection row to one navigation stop

This change removes the unnecessary navigation stop on the "Add
Connection" cr-expand-button. Previously, this was read by ChromeVox as
first stop: "Add connection", second stop: "Add network connection,
[Expanded|Collapsed], Button". Now, only the second stop will be read.

Bug: 1012565
Change-Id: I42ac19da1d3813cf17830c340c7ef883c2e7ab91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915089Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715409}

chrome/browser/resources/settings/internet_page/internet_page.html

@@ -46,7 +46,9 @@
               class="settings-box two-line"
               expanded="{{addConnectionExpanded_}}"
               id="expandAddConnections">
-            $i18n{internetAddConnection}
+            <span aria-hidden="true">
+              $i18n{internetAddConnection}
+            </span>
           </cr-expand-button>
           <template is="dom-if" if="[[addConnectionExpanded_]]">
             <div class="list-frame vertical-list">