GitLab

Label the detail_view.html's icon with an aria-label, indicating it's
related to the extension, similar to what's done in item.html. Move
the code to be part of ItemBehavior so it can be easily shared between
the two.

Bug: 1100943
Change-Id: Idb888c899ab96349a5df0fba74e60d481e619823
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542951Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833565}