Fix an NPE as DownloadManager.query() could return a null cursor

Fix an NPE as DownloadManager.query() could return a null cursor

Although not documented on SDK page, this is possible in DownloadManager
source code.

BUG=618458
Committed: https://crrev.com/757b19c57cfac1fdb034e9b79a80c2dcee9da260
Cr-Commit-Position: refs/heads/master@{#412696}

[qinmin, 2016-08-17 22:57:11]

Patchset #1 (id:1) has been deleted

[qinmin, 2016-08-17 22:57:47]

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

[qinmin, 2016-08-17 22:57:47]

PTAL

[gone, 2016-08-17 23:00:08]

lgtm

[qinmin, 2016-08-17 23:02:14]

The CQ bit was checked by qinmin@chromium.org

[commit-bot: I haz the power, 2016-08-17 23:02:45]

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, 2016-08-17 23:51:55]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-08-18 00:01:30]

Description was changed from

==========
Fix an NPE as DownloadManager.query() could return a null cursor

Although not documented on SDK page, this is possible in DownloadManager
source code.

BUG=618458
==========

to

==========
Fix an NPE as DownloadManager.query() could return a null cursor

Although not documented on SDK page, this is possible in DownloadManager
source code.

BUG=618458

Committed: https://crrev.com/757b19c57cfac1fdb034e9b79a80c2dcee9da260
Cr-Commit-Position: refs/heads/master@{#412696}
==========

[commit-bot: I haz the power, 2016-08-18 00:01:31]

Patchset 1 (id:??) landed as
https://crrev.com/757b19c57cfac1fdb034e9b79a80c2dcee9da260
Cr-Commit-Position: refs/heads/master@{#412696}