Fullscreen Notifications: Fix crash if delegate is NULL

Fullscreen Notifications: Fix crash if delegate is NULL

Notification Delegates should never be NULL but it is not enforced with
a DCHECK, so of course there is a delegate that is null (for the ChromeOS
Battery notification).  So fix the logic that never checks the delegate's
validity in FullscreenNotificationBlocker.

R=bmalcolm@chromium.org
BUG=660889
TEST=have a fullscreen app window and drain the battery
     below the warning level.

Review-Url: https://codereview.chromium.org/2459263004
Cr-Commit-Position: refs/heads/master@{#428825}
(cherry picked from commit b58f87810fac6a4d5ef606032a35ed8e8b179bd2)

Committed: https://chromium.googlesource.com/chromium/src/+/3bd6317c8d9449690991c07ff4f1957449d70fee

[dewittj, 2016-11-01 15:48:02]

Description was changed from

==========
Fullscreen Notifications: Fix crash if delegate is NULL

Notification Delegates should never be NULL but it is not enforced with
a DCHECK, so of course there is a delegate that is null (for the ChromeOS
Battery notification).  So fix the logic that never checks the delegate's
validity in FullscreenNotificationBlocker.

R=bmalcolm@chromium.org
BUG=660889
TEST=have a fullscreen app window and drain the battery
     below the warning level.

Review-Url: https://codereview.chromium.org/2459263004
Cr-Commit-Position: refs/heads/master@{#428825}
(cherry picked from commit b58f87810fac6a4d5ef606032a35ed8e8b179bd2)
==========

to

==========
Fullscreen Notifications: Fix crash if delegate is NULL

Notification Delegates should never be NULL but it is not enforced with
a DCHECK, so of course there is a delegate that is null (for the ChromeOS
Battery notification).  So fix the logic that never checks the delegate's
validity in FullscreenNotificationBlocker.

R=bmalcolm@chromium.org
BUG=660889
TEST=have a fullscreen app window and drain the battery
     below the warning level.

Review-Url: https://codereview.chromium.org/2459263004
Cr-Commit-Position: refs/heads/master@{#428825}
(cherry picked from commit b58f87810fac6a4d5ef606032a35ed8e8b179bd2)

Committed:
https://chromium.googlesource.com/chromium/src/+/3bd6317c8d9449690991c07ff4f1...
==========

[dewittj, 2016-11-01 15:48:04]

Committed patchset #1 (id:1) manually as
3bd6317c8d9449690991c07ff4f1957449d70fee.