Re-enabling 720p webcam test for QTKit on Mac.

Re-enabling 720p webcam test for QTKit on Mac.

mcasas tested it and it appears to work now.

BUG=440762
Committed: https://crrev.com/6ad0306bf6039949bf7a572b07a839a3e6cd1ebb
Cr-Commit-Position: refs/heads/master@{#322572}

[phoglund_chromium, 2015-03-27 08:55:33]

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

[perkj_chrome, 2015-03-27 09:23:07]

lgtm

[phoglund_chromium, 2015-03-27 13:18:28]

The CQ bit was checked by phoglund@chromium.org

[commit-bot: I haz the power, 2015-03-27 13:18:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1039163002/1

[commit-bot: I haz the power, 2015-03-27 14:11:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 14:13:05]

Patchset 1 (id:??) landed as
https://crrev.com/6ad0306bf6039949bf7a572b07a839a3e6cd1ebb
Cr-Commit-Position: refs/heads/master@{#322572}

[tommi (sloooow) - chröme, 2015-04-03 19:29:22]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1059163003/ by tommi@chromium.org.

The reason for reverting is: Doesn't look fixed.  This has been consistently
failing since landing, here:

https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester?numbuilds=200.