GitLab

Move the aria-label and title from the pencil icon to the whole button.
Also combine customizeBackground and customizeThisPage strings as they
are the same.

Bug: 976217
Change-Id: Ia18620e6c69e81a64ce1020d51f7f5c18e62f99a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704390Reviewed-by: Kyle Milka <kmilka@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678325}