The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d07641f34f029fcbb20f016c179e68bb6e70a250

commit d07641f34f029fcbb20f016c179e68bb6e70a250
Author: qinmin <qinmin@chromium.org>
Date: Thu Nov 17 01:55:27 2016

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 

Review-Url: https://codereview.chromium.org/2507973002
Cr-Commit-Position: refs/heads/master@{#432697}

[modify] https://crrev.com/d07641f34f029fcbb20f016c179e68bb6e70a250/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java