Revert of Temporarily disable WebView fullscreen video tests until we land fullscreen IPC changes

Revert of Temporarily disable WebView fullscreen video tests until we land fullscreen IPC changes (https://codereview.chromium.org/364043002/)

Reason for revert:
revert this as all related CLs are submitted

Original issue's description:
> Temporarily disable WebView fullscreen video tests until we land fullscreen IPC changes
> 
> there are 2 changes needs to be submitted before we reenable the tests:
> 1. https://codereview.chromium.org/290643005/ and
> 2. https://codereview.chromium.org/292573004/
> 
> the blink change will break all the tests, so we need to reenable the tests after the chromium change lands
> 
> BUG=367346
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281165

TBR=boliu@chromium.org
BUG=367346
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282158

[qinmin, 2014-07-09 16:34:10]

Created Revert of Temporarily disable WebView fullscreen video tests until we
land fullscreen IPC changes

[boliu, 2014-07-09 16:34:54]

The CQ bit was unchecked by boliu@chromium.org

[boliu, 2014-07-09 16:35:05]

ditto...

[qinmin, 2014-07-09 16:51:09]

The CQ bit was checked by qinmin@chromium.org

[commit-bot: I haz the power, 2014-07-09 16:52:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qinmin@chromium.org/383433002/1

[commit-bot: I haz the power, 2014-07-09 21:05:23]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-07-09 23:00:36]

Change committed as 282158