[Coordinated Graphics] Pass the ownership of GraphicsSurface explicitly
https://bugs.webkit.org/show_bug.cgi?id=117379

Patch by Jae Hyun Park <jae.park@company100.net> on 2013-06-08
Reviewed by Noam Rosenthal.

When creating WebCoordinatedSurface with GraphicsSurface, it is clearer
to pass the ownership of the created GraphicsSurface explicitly.

* Shared/CoordinatedGraphics/WebCoordinatedSurface.cpp:
(WebKit::WebCoordinatedSurface::create):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151353 268f45cc-cd09-0410-ab3c-d52691b4dbfc