Revert of Migrate TestCommon to Chromium c++ style and remove un-used header.

Revert of Migrate TestCommon to Chromium c++ style and remove un-used header. (https://codereview.chromium.org/436133002/)

Reason for revert:
This patch removed some touch event logging in TestPlugin.cpp which broke the following layout tests

plugins/touch-events-details.html
plugins/touch-events-synthesized.html
plugins/transformed-events.html

Reverting.

Original issue's description:
> Migrate TestCommon to Chromium c++ style and remove un-used header.
> 
> Changes:
> 1) Run clang-format through source and header files.
> 2) Rename data member variables to use unix_hacker_ style.
> 3) Rename methods to use CamelCase style.
> 4) Rename file name to test_common.
> 5) Removed un-used test_common header.
> 
> BUG=331299
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287382

TBR=jochen@chromium.org,abhishek.a21@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=331299
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287468

[rjwright, 2014-08-05 06:15:42]

Created Revert of Migrate TestCommon to Chromium c++ style and remove un-used
header.

[commit-bot: I haz the power, 2014-08-05 06:16:41]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rjwright@chromium.org/439973002/1

[commit-bot: I haz the power, 2014-08-05 06:18:31]

Change committed as 287468