Only apply "unlabled image" roledescription a11y attribute on images

The roledescription accessibility attribute was being set on kLinks
and kRootWebArea. This can cause screen readers to announce the item
as "unlabled image" which is misleading when it's not an image. This
removes adding that attribute on anything but images to avoid
confusion.

Bug: 998232
Change-Id: Ic11c3f02a7f439eabcf727f4d4fb08181e196ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834345
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Jessica Tallon <jtallon@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709486}
2 files changed