Patch by Nandor Huszka <hnandor@inf.u-szeged.hu> on 2012-10-02
Reviewed by Csaba Osztrogonác.

systemAllowsMultisamplingOnATICards was deleted from GraphicsContext3D,
but function body remained in GraphicsContext3DOpenGLES. Delete method body.

* platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@130252 268f45cc-cd09-0410-ab3c-d52691b4dbfc