Remove extra navigation stops for rows within Add Connection expandable

Previously the text on each row and the action button for each row were
separate navigation stops when using ChromeVox. With this change, the
text for each row is no longer its own navigation stop since the text is
the aria-label for the icon.

Bug: 1012565
Change-Id: I23f5d4584fd03b98cab6c7e656711fdd4fcae6cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913568Reviewed-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@{#714791}

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

@@ -51,19 +51,21 @@
             <div class="list-frame vertical-list">
               <template is="dom-if" if="[[wifiIsEnabled_(deviceStates)]]">
                 <div actionable class="list-item" on-click="onAddWiFiTap_">
-                  <div class="start settings-box-text">
+                  <div class="start settings-box-text"
+                      id="add-wifi-label" aria-hidden="true">
                     $i18n{internetAddWiFi}
                   </div>
                   <cr-icon-button class="icon-add-wifi"
-                      aria-label="$i18n{internetAddWiFi}"></cr-icon-button>
+                      aria-labelledby="add-wifi-label"></cr-icon-button>
                 </div>
               </template>
               <div actionable class="list-item" on-click="onAddVPNTap_">
-                <div class="start settings-box-text">
+                <div class="start settings-box-text"
+                    id="add-vpn-label" aria-hidden="true">
                   $i18n{internetAddVPN}
                 </div>
                 <cr-icon-button class="icon-add-circle"
-                    aria-label="$i18n{internetAddVPN}"></cr-icon-button>
+                    aria-labelledby="add-vpn-label"></cr-icon-button>
               </div>
               <template is="dom-repeat" items="[[vpnProviders_]]">
                 <div actionable class="list-item"