Replace role="presentation" with aria-hidden="true" in order to fix a previous
attempt at fixing an issue where screen readers will navigate to the hidden
input of focusable containers when they should not:
https://github.com/gwtproject/gwt/commit/bda85103bd88e9a58d0158e5a4a2946519e99bed

Change-Id: I3dc0ecaa017a0fe5af8ea1dabb19cfacfe4d17a9

user/src/com/google/gwt/user/client/ui/impl/FocusImplStandard.java

diff --git a/user/src/com/google/gwt/user/client/ui/impl/FocusImplStandard.java b/user/src/com/google/gwt/user/client/ui/impl/FocusImplStandard.java
index f834a98..e094149 100644
--- a/user/src/com/google/gwt/user/client/ui/impl/FocusImplStandard.java
+++ b/user/src/com/google/gwt/user/client/ui/impl/FocusImplStandard.java
@@ -42,7 +42,7 @@
     var input = $doc.createElement('input');
     input.type = 'text';
     input.tabIndex = -1;
-    input.setAttribute('role', 'presentation');
+    input.setAttribute('aria-hidden', 'true');
     var style = input.style;
     style.opacity = 0;
     style.height = '1px';