Make empty sign-in banner hidden to avoid blocking user removal button

Make empty sign-in banner hidden to avoid blocking user removal button

1) 'Remove user' button may be blocked by a transparent sign-in banner and
becomes unclickable, so hide the banner if it's empty. Also adjust the
z-index of the button to be the same with the user menu.

2) Minor change on the positioning of the user menu area. 

BUG=730155
Review-Url: https://codereview.chromium.org/2926743002
Cr-Commit-Position: refs/heads/master@{#477708}
Committed: https://chromium.googlesource.com/chromium/src/+/1e531eb4ecf2fbf80ce97b92e00de76f46969c8a

[Wenzhao (Colin) Zang, 2017-06-06 22:37:57]

Description was changed from

==========
Make empty sign-in banner hidden to avoid blocking user removal button

BUG=730155
==========

to

==========
Make empty sign-in banner hidden to avoid blocking user removal button

1) 'Remove user' button may be blocked by a transparent sign-in banner and
becomes unclickable, so hide the banner if it's empty. Also adjust the
z-index of the button to be the same with the user menu.

2) Minor change on the positioning of the user menu area. 

BUG=730155
==========

[Wenzhao (Colin) Zang, 2017-06-06 22:37:57]

wzang@chromium.org changed reviewers:
+ jdufault@chromium.org, xiyuan@chromium.org

[jdufault, 2017-06-07 17:22:06]

lgtm

[xiyuan, 2017-06-07 17:40:13]

lgtm

[Wenzhao (Colin) Zang, 2017-06-07 17:55:31]

The CQ bit was checked by wzang@chromium.org

[commit-bot: I haz the power, 2017-06-07 17:56:08]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-07 18:13:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496858131773590, "parent_rev":
"ea19acc0fca1c00e9ea1dd01df0a462126902faf", "commit_rev":
"1e531eb4ecf2fbf80ce97b92e00de76f46969c8a"}

[commit-bot: I haz the power, 2017-06-07 18:13:22]

Description was changed from

==========
Make empty sign-in banner hidden to avoid blocking user removal button

1) 'Remove user' button may be blocked by a transparent sign-in banner and
becomes unclickable, so hide the banner if it's empty. Also adjust the
z-index of the button to be the same with the user menu.

2) Minor change on the positioning of the user menu area. 

BUG=730155
==========

to

==========
Make empty sign-in banner hidden to avoid blocking user removal button

1) 'Remove user' button may be blocked by a transparent sign-in banner and
becomes unclickable, so hide the banner if it's empty. Also adjust the
z-index of the button to be the same with the user menu.

2) Minor change on the positioning of the user menu area. 

BUG=730155

Review-Url: https://codereview.chromium.org/2926743002
Cr-Commit-Position: refs/heads/master@{#477708}
Committed:
https://chromium.googlesource.com/chromium/src/+/1e531eb4ecf2fbf80ce97b92e00d...
==========

[commit-bot: I haz the power, 2017-06-07 18:13:24]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/1e531eb4ecf2fbf80ce97b92e00d...