Oobe child specific sign in: update aria label

Bug: 1101318
Change-Id: Ie14f5f199af160aee865570b364ef8387e5a0499
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359993Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Yunke Zhou <yunkez@google.com>
Cr-Commit-Position: refs/heads/master@{#799180}

chrome/browser/resources/chromeos/login/family_link_notice.html

@@ -13,7 +13,8 @@ found in the LICENSE file. -->
         --oobe-dialog-content-padding-top: 0;
       }
     </style>
-    <oobe-dialog id="familyLinkDialog" role="dialog" has-buttons>
+    <oobe-dialog id="familyLinkDialog" role="dialog" has-buttons
+        aria-label$="[[getDialogTitle_(locale, email_, domain_)]]">
       <hd-iron-icon slot="oobe-icon"
           icon1x="oobe-32:family" icon2x="oobe-64:family">
       </hd-iron-icon>

chrome/browser/resources/chromeos/login/user_creation.html

@@ -55,6 +55,7 @@ found in the LICENSE file. -->
     </style>
     <oobe-dialog id="userCreationDialog" role="dialog" has-buttons
         title-key="userCreationTitle" subtitle-key="userCreationSubtitle"
+        aria-label$="[[i18nDynamic(locale, 'userCreationTitle')]]"
         for-step="create">
       <hd-iron-icon icon1x="oobe-32:googleg" icon2x="oobe-64:googleg"
         slot="oobe-icon">
@@ -102,6 +103,7 @@ found in the LICENSE file. -->
     </oobe-dialog>
     <oobe-dialog id="childSignInDialog" role="dialog" has-buttons
         title-key="childSignInTitle" subtitle-key="childSignInSubtitle"
+        aria-label$="[[i18nDynamic(locale, 'childSignInTitle')]]"
         for-step="child">
       <hd-iron-icon icon1x="oobe-32:family" icon2x="oobe-64:family"
         slot="oobe-icon">