Reduce flakiness in IvfFileWriter tests.

Reduce flakiness in IvfFileWriter tests.

If deleting files fails, wait a sec and retry. This can help in case
and antivirus software or similar has locked the file, preventing it
from being deleted.

BUG=webrtc:5898
Committed: https://crrev.com/73257d1b5a281ed76f553940f16546c59a4207b9
Cr-Commit-Position: refs/heads/master@{#12917}

[sprang_webrtc, 2016-05-26 09:14:12]

sprang@webrtc.org changed reviewers:
+ pbos@webrtc.org

[pbos-webrtc, 2016-05-26 11:37:08]

eew, lgtm

[sprang, 2016-05-26 12:34:31]

The CQ bit was checked by sprang@google.com

[commit-bot: I haz the power, 2016-05-26 12:34:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2014823002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2014823002/1

[commit-bot: I haz the power, 2016-05-26 12:45:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-26 12:46:06]

Description was changed from

==========
Reduce flakiness in IvfFileWriter tests.

If deleting files fails, wait a sec and retry. This can help in case
and antivirus software or similar has locked the file, preventing it
from being deleted.

BUG=webrtc:5898
==========

to

==========
Reduce flakiness in IvfFileWriter tests.

If deleting files fails, wait a sec and retry. This can help in case
and antivirus software or similar has locked the file, preventing it
from being deleted.

BUG=webrtc:5898

Committed: https://crrev.com/73257d1b5a281ed76f553940f16546c59a4207b9
Cr-Commit-Position: refs/heads/master@{#12917}
==========

[commit-bot: I haz the power, 2016-05-26 12:46:07]

Patchset 1 (id:??) landed as
https://crrev.com/73257d1b5a281ed76f553940f16546c59a4207b9
Cr-Commit-Position: refs/heads/master@{#12917}