Change requisite hardware checks for enabling antialiasing.
https://bugs.webkit.org/show_bug.cgi?id=114101
<rdar://problem/12342776>.

m_maySupportMultisampling should be true by default for all platforms/hardware now except older versions of AMD.

Reviewed by Dean Jackson.

* platform/graphics/opengl/Extensions3DOpenGLCommon.cpp:
(WebCore::Extensions3DOpenGLCommon::Extensions3DOpenGLCommon):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148060 268f45cc-cd09-0410-ab3c-d52691b4dbfc