Fix an issue that filename is missing in download failure notification

Fix an issue that filename is missing in download failure notification

When resuming a download, it is possible that the download is not in
history db.
In this case, native code won't be able to provide the filename.
We need to get the file name from sharedpreferences

TBR=michaelbai@chromium.org
BUG=614867
Review-Url: https://codereview.chromium.org/2007983007
Cr-Commit-Position: refs/heads/master@{#396321}
(cherry picked from commit c916d5295b2c636581db6271c242e35bf7394411)

Committed: https://chromium.googlesource.com/chromium/src/+/51af006325a102d9a29830fe98dff32ed02824b4

[qinmin, 2016-05-27 19:22:17]

Description was changed from

==========
Fix an issue that filename is missing in download failure notification

When resuming a download, it is possible that the download is not in
history db.
In this case, native code won't be able to provide the filename.
We need to get the file name from sharedpreferences

TBR=michaelbai@chromium.org
BUG=614867

Review-Url: https://codereview.chromium.org/2007983007
Cr-Commit-Position: refs/heads/master@{#396321}
(cherry picked from commit c916d5295b2c636581db6271c242e35bf7394411)
==========

to

==========
Fix an issue that filename is missing in download failure notification

When resuming a download, it is possible that the download is not in
history db.
In this case, native code won't be able to provide the filename.
We need to get the file name from sharedpreferences

TBR=michaelbai@chromium.org
BUG=614867

Review-Url: https://codereview.chromium.org/2007983007
Cr-Commit-Position: refs/heads/master@{#396321}
(cherry picked from commit c916d5295b2c636581db6271c242e35bf7394411)

Committed:
https://chromium.googlesource.com/chromium/src/+/51af006325a102d9a29830fe98df...
==========

[qinmin, 2016-05-27 19:22:18]

Committed patchset #1 (id:1) manually as
51af006325a102d9a29830fe98dff32ed02824b4 (presubmit successful).