Fix an issue that "download pending" is showing for download with unknown size

Fix an issue that "download pending" is showing for download with unknown size

DownloadNotificationService currently cannot differentiate pending download from download with unknown sizes.
This CL fixes the issue.

BUG=666069
Committed: https://crrev.com/d07641f34f029fcbb20f016c179e68bb6e70a250
Cr-Commit-Position: refs/heads/master@{#432697}

[qinmin, 2016-11-16 22:22:17]

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

[qinmin, 2016-11-16 22:22:18]

PTAL

[gone, 2016-11-16 22:33:13]

lgtm

[qinmin, 2016-11-16 23:00:18]

The CQ bit was checked by qinmin@chromium.org

[commit-bot: I haz the power, 2016-11-16 23:00:51]

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, 2016-11-17 01:56:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 02:07:14]

Description was changed from

==========
Fix an issue that "download pending" is showing for download with unknown size

DownloadNotificationService currently cannot differentiate pending download from
download with unknown sizes.
This CL fixes the issue.

BUG=666069
==========

to

==========
Fix an issue that "download pending" is showing for download with unknown size

DownloadNotificationService currently cannot differentiate pending download from
download with unknown sizes.
This CL fixes the issue.

BUG=666069

Committed: https://crrev.com/d07641f34f029fcbb20f016c179e68bb6e70a250
Cr-Commit-Position: refs/heads/master@{#432697}
==========

[commit-bot: I haz the power, 2016-11-17 02:07:15]

Patchset 1 (id:??) landed as
https://crrev.com/d07641f34f029fcbb20f016c179e68bb6e70a250
Cr-Commit-Position: refs/heads/master@{#432697}