Fix leak reported by valgrind in VideoDestinationHandlerTest.PutFrame

Fix leak reported by valgrind in VideoDestinationHandlerTest.PutFrame

This fix a problem in the unittest where the test ends before all pending cleanup tasks have
completed.

Revert "[MemSheriff] Suppress content_unittests leaks and uninits"
This reverts commit 8ea251ca5220a7875f9d50a583575b07522d478c.

BUG=422087
Committed: https://crrev.com/82c77b1fe9c13273dd115cc3a9ae9c64b414e538
Cr-Commit-Position: refs/heads/master@{#299123}

[perkj_chrome, 2014-10-10 09:04:17]

perkj@chromium.org changed reviewers:
+ tommi@chromium.org

[perkj_chrome, 2014-10-10 09:04:20]

Can you please review?

[tommi (sloooow) - chröme, 2014-10-10 13:32:13]

lgtm

[perkj_chrome, 2014-10-10 13:55:42]

The CQ bit was checked by perkj@chromium.org

[commit-bot: I haz the power, 2014-10-10 13:56:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/649513003/1

[commit-bot: I haz the power, 2014-10-10 13:59:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-10 13:59:01]

Try jobs failed on following builders:
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/67202)
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_gn_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[perkj_chrome, 2014-10-10 15:03:22]

The CQ bit was checked by perkj@chromium.org

[commit-bot: I haz the power, 2014-10-10 15:03:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/649513003/250001

[commit-bot: I haz the power, 2014-10-10 16:18:37]

Committed patchset #3 (id:250001)

[commit-bot: I haz the power, 2014-10-10 16:19:18]

Patchset 3 (id:??) landed as
https://crrev.com/82c77b1fe9c13273dd115cc3a9ae9c64b414e538
Cr-Commit-Position: refs/heads/master@{#299123}