GitLab

Some feature pod buttons have same action for both the icon and the
label. In such case, the label button should not be included in keybaord
focus chain.

TEST=manual
BUG=none

Change-Id: I1e2c87c5bfdc18ce4ca233807e94053313e9830d
Reviewed-on: https://chromium-review.googlesource.com/1152716Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578972}