Delete ffmpeg_unittests.

Delete ffmpeg_unittests.

They've been supplanted by ffmpeg_regression_tests. They also crash
when you run them.

TBR=glider

Committed: https://crrev.com/2ea2305f8d6417b49a2461f56a9069e456095609
Cr-Commit-Position: refs/heads/master@{#308227}

[scherkus (not reviewing), 2014-12-12 23:53:27]

scherkus@chromium.org changed reviewers:
+ wolenetz@chromium.org

[wolenetz, 2014-12-13 00:00:38]

lgtm %:
1. it looks like tools/valgrind/chrome_tests.py also will need update to remove
'ffmpeg' and 'ffmpeg_unittests' from "The known list of tests"
2. bots passing, including tooling bots like those that might use
chrome_tests.py, for example (I'm not sure which these might be).

[scherkus (not reviewing), 2014-12-13 00:42:41]

scherkus@chromium.org changed reviewers:
+ glider@chromium.org

[scherkus (not reviewing), 2014-12-13 00:42:41]

glider: FYI for tools/valgrind/*

[scherkus (not reviewing), 2014-12-13 00:42:51]

The CQ bit was checked by scherkus@chromium.org

[commit-bot: I haz the power, 2014-12-13 00:44:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/801993002/20001

[commit-bot: I haz the power, 2014-12-13 02:23:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-13 02:24:32]

Patchset 2 (id:??) landed as
https://crrev.com/2ea2305f8d6417b49a2461f56a9069e456095609
Cr-Commit-Position: refs/heads/master@{#308227}