remove unused Leak() function

cc: Remove unused Leak() function

I stumbled on this while working on the dff change.  It looks
like the only place this function is used is in the test.

I removed the test as well, since its only purpose was to check
that calling leak would indeed leak.

Committed: https://crrev.com/ae18399fc109d4b6740c819743a8028729151b3a
Cr-Commit-Position: refs/heads/master@{#300321}

[hendrikw, 2014-10-20 17:29:55]

hendrikw@chromium.org changed reviewers:
+ reveman@chromium.org

[hendrikw, 2014-10-20 17:30:24]

Remove dead code, PTAL thanks!

[reveman, 2014-10-20 18:01:36]

thanks, lgtm

[hendrikw, 2014-10-20 18:03:06]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2014-10-20 18:03:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652583002/70001

[commit-bot: I haz the power, 2014-10-20 20:23:36]

Committed patchset #3 (id:70001)

[commit-bot: I haz the power, 2014-10-20 20:24:17]

Patchset 3 (id:??) landed as
https://crrev.com/ae18399fc109d4b6740c819743a8028729151b3a
Cr-Commit-Position: refs/heads/master@{#300321}