Use system download completion notification if app notification is disabled.

Use system download completion notification if app notification is disabled.

Because all download now goes through Chrome, user will not see
notification if app notification is disabled.
This change allows us to use system DownloadManager to display the
completion notification,
in case app notification is disabled.

BUG=648221
Committed: https://crrev.com/b9d324d288c1d36ae14398e367e0abfa15e97075
Cr-Commit-Position: refs/heads/master@{#421959}

[qinmin, 2016-09-29 20:45:32]

qinmin@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[qinmin, 2016-09-29 20:45:33]

PTAL

[gone, 2016-09-29 21:00:58]

lgtm

[qinmin, 2016-09-29 21:49:57]

The CQ bit was checked by qinmin@chromium.org

[commit-bot: I haz the power, 2016-09-29 21:50:40]

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, 2016-09-29 22:30:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-29 22:39:54]

Description was changed from

==========
Use system download completion notification if app notification is disabled.

Because all download now goes through Chrome, user will not see
notification if app notification is disabled.
This change allows us to use system DownloadManager to display the
completion notification,
in case app notification is disabled.

BUG=648221
==========

to

==========
Use system download completion notification if app notification is disabled.

Because all download now goes through Chrome, user will not see
notification if app notification is disabled.
This change allows us to use system DownloadManager to display the
completion notification,
in case app notification is disabled.

BUG=648221

Committed: https://crrev.com/b9d324d288c1d36ae14398e367e0abfa15e97075
Cr-Commit-Position: refs/heads/master@{#421959}
==========

[commit-bot: I haz the power, 2016-09-29 22:39:55]

Patchset 1 (id:??) landed as
https://crrev.com/b9d324d288c1d36ae14398e367e0abfa15e97075
Cr-Commit-Position: refs/heads/master@{#421959}