Fix activation issues with SystemTrayBubble.

Fix activation issues with SystemTrayBubble.

1) Don't close on deactivation. The bubble is normally not
   activatable, but after pressing Tab it becomes activatable.
   It should behave the same in either case, so don't close
   on deactivation.
2) Explicitly close the info bubble instead of relying on
   activation changes which may or may not go through.

BUG=716397
Review-Url: https://codereview.chromium.org/2867933002
Cr-Original-Commit-Position: refs/heads/master@{#470728}
Review-Url: https://codereview.chromium.org/2876363004 .
Cr-Commit-Position: refs/branch-heads/3071@{#554}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/3ae3d987dd8fcad652c562bddc3ef66390eb65fc

[Evan Stade, 2017-05-15 16:44:46]

Description was changed from

==========
Fix activation issues with SystemTrayBubble.

1) Don't close on deactivation. The bubble is normally not
   activatable, but after pressing Tab it becomes activatable.
   It should behave the same in either case, so don't close
   on deactivation.
2) Explicitly close the info bubble instead of relying on
   activation changes which may or may not go through.

BUG=716397

Review-Url: https://codereview.chromium.org/2867933002
Cr-Commit-Position: refs/heads/master@{#470728}
(cherry picked from commit eadedef7305278a22fca35db34b2831135ff5fb2)
==========

to

==========
Fix activation issues with SystemTrayBubble.

1) Don't close on deactivation. The bubble is normally not
   activatable, but after pressing Tab it becomes activatable.
   It should behave the same in either case, so don't close
   on deactivation.
2) Explicitly close the info bubble instead of relying on
   activation changes which may or may not go through.

BUG=716397

Review-Url: https://codereview.chromium.org/2867933002
Cr-Original-Commit-Position: refs/heads/master@{#470728}
Review-Url: https://codereview.chromium.org/2876363004 .
Cr-Commit-Position: refs/branch-heads/3071@{#554}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/3ae3d987dd8fcad652c562bddc3e...
==========

[Evan Stade, 2017-05-15 16:44:47]

Committed patchset #1 (id:1) manually as
3ae3d987dd8fcad652c562bddc3ef66390eb65fc.