Revert of x11/test: Use a custom-deleter for the stored XEvent.

Revert of x11/test: Use a custom-deleter for the stored XEvent. (https://codereview.chromium.org/136153006/)

Reason for revert:
This seems to cause leaks:
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASAN%20Tests%20%282%29/builds/22514/steps/content_unittests/logs/TestMakeWebKeyboardEvent
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASAN%20Tests%20%282%29/builds/22514/steps/content_unittests/logs/TestMakeWebKeyboardEventWindowsKeyCode

Original issue's description:
> x11/test: Use a custom-deleter for the XEvent in ScopedXI2Event.
> 
> BUG=none
> R=sky@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=248512

TBR=sky@chromium.org,sadrul@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=248526

[msw, 2014-02-03 18:06:26]

Created Revert of x11/test: Use a custom-deleter for the stored XEvent.

[commit-bot: I haz the power, 2014-02-03 18:07:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/msw@chromium.org/135393011/1

[commit-bot: I haz the power, 2014-02-03 18:09:54]

Change committed as 248526

[commit-bot: I haz the power, 2014-02-03 18:10:02]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-02-03 18:10:03]

CQ bit was unchecked on CL. Ignoring.