Fix an issue that android doesn't know how to open the download after completion

Fix an issue that android doesn't know how to open the download after completion

When downloading a file, the Mime type could be generic.
Chrome used to callremapGenericMimeType for downloads going through Android
DownloadManager.
It should do the same for downloads handled by Chrome's network stack.

BUG=597914
Committed: https://crrev.com/2f54b5c49b1fe73dd179ac34e81a3d2575ef8cb7
Cr-Commit-Position: refs/heads/master@{#413550}

[qinmin, 2016-08-22 19:34:21]

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

[qinmin, 2016-08-22 19:34:22]

PTAL

[Ted C, 2016-08-22 20:10:26]

lgtm

[qinmin, 2016-08-22 20:29:10]

The CQ bit was checked by qinmin@chromium.org

[commit-bot: I haz the power, 2016-08-22 20:29:47]

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, 2016-08-22 22:11:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-22 22:12:16]

Description was changed from

==========
Fix an issue that android doesn't know how to open the download after completion

When downloading a file, the Mime type could be generic.
Chrome used to callremapGenericMimeType for downloads going through Android
DownloadManager.
It should do the same for downloads handled by Chrome's network stack.

BUG=597914
==========

to

==========
Fix an issue that android doesn't know how to open the download after completion

When downloading a file, the Mime type could be generic.
Chrome used to callremapGenericMimeType for downloads going through Android
DownloadManager.
It should do the same for downloads handled by Chrome's network stack.

BUG=597914

Committed: https://crrev.com/2f54b5c49b1fe73dd179ac34e81a3d2575ef8cb7
Cr-Commit-Position: refs/heads/master@{#413550}
==========

[commit-bot: I haz the power, 2016-08-22 22:12:17]

Patchset 1 (id:??) landed as
https://crrev.com/2f54b5c49b1fe73dd179ac34e81a3d2575ef8cb7
Cr-Commit-Position: refs/heads/master@{#413550}