Re-enabling 720p WebRTC video quality test.

Re-enabling 720p WebRTC video quality test.

Closing the local streams seems to solve the buffer thrashing that's
going on while gathering frames; this should stop the test from
timing out on Windows.

BUG=532918, webrtc:4986
Committed: https://crrev.com/5743af3d0c098fa86f587269519e226ecce185e4
Cr-Commit-Position: refs/heads/master@{#351034}

[phoglund_chromium, 2015-09-23 10:30:20]

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

[phoglund_chromium, 2015-09-25 10:50:44]

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

[perkj_chrome, 2015-09-28 07:37:11]

On 2015/09/25 10:51:15, phoglund_chrome wrote:

lgtm

[phoglund_chromium, 2015-09-28 07:45:25]

The CQ bit was checked by phoglund@chromium.org

[commit-bot: I haz the power, 2015-09-28 07:45:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1367453002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1367453002/20001

[commit-bot: I haz the power, 2015-09-28 08:18:19]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-28 08:19:05]

Patchset 2 (id:??) landed as
https://crrev.com/5743af3d0c098fa86f587269519e226ecce185e4
Cr-Commit-Position: refs/heads/master@{#351034}

[phoglund_chromium, 2015-09-28 12:10:03]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1372923002/ by phoglund@chromium.org.

The reason for reverting is: Still too slow for one of our win7 bots..