Fixed overlapping subtle notifications on Mac.

Fixed overlapping subtle notifications on Mac.

Can happen when a fullscreen/pointer-lock bubble and a new-back-shortcut
bubble are visible at the same time. Now the new bubble will dismiss the
old bubble (which is the behaviour on Views platforms).

BUG=615971
Review-Url: https://codereview.chromium.org/2028963002
Cr-Commit-Position: refs/heads/master@{#397973}
(cherry picked from commit e1ec367efc1eeae3ba9fcb7309d4e0be44e6c44f)

Committed: https://chromium.googlesource.com/chromium/src/+/011b06586201c9bdcd9d1959455a0454ac028be2

[Matt Giuca, 2016-06-14 04:11:30]

Description was changed from

==========
Fixed overlapping subtle notifications on Mac.

Can happen when a fullscreen/pointer-lock bubble and a new-back-shortcut
bubble are visible at the same time. Now the new bubble will dismiss the
old bubble (which is the behaviour on Views platforms).

BUG=615971

Review-Url: https://codereview.chromium.org/2028963002
Cr-Commit-Position: refs/heads/master@{#397973}
(cherry picked from commit e1ec367efc1eeae3ba9fcb7309d4e0be44e6c44f)
==========

to

==========
Fixed overlapping subtle notifications on Mac.

Can happen when a fullscreen/pointer-lock bubble and a new-back-shortcut
bubble are visible at the same time. Now the new bubble will dismiss the
old bubble (which is the behaviour on Views platforms).

BUG=615971

Review-Url: https://codereview.chromium.org/2028963002
Cr-Commit-Position: refs/heads/master@{#397973}
(cherry picked from commit e1ec367efc1eeae3ba9fcb7309d4e0be44e6c44f)

Committed:
https://chromium.googlesource.com/chromium/src/+/011b06586201c9bdcd9d1959455a...
==========

[Matt Giuca, 2016-06-14 04:11:33]

Committed patchset #1 (id:1) manually as
011b06586201c9bdcd9d1959455a0454ac028be2 (tree was closed).