Unreviewed, rolling out r136609.
http://trac.webkit.org/changeset/136609
https://bugs.webkit.org/show_bug.cgi?id=103793

Breaking Chrome/Mac Debug builds.

Source/Platform:

* Platform.gyp/Platform.gyp:
* chromium/public/WebGraphicsContext3D.h:
(Attributes):

Source/WebCore:

* html/canvas/WebGLRenderingContext.cpp:
(WebCore):
(WebCore::WebGLRenderingContext::create):
* platform/chromium/support/GraphicsContext3DChromium.cpp:
(WebCore::GraphicsContext3D::create):
* platform/graphics/GraphicsContext3D.h:
(Attributes):

Source/WebKit/chromium:

* WebKit.gyp:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@136734 268f45cc-cd09-0410-ab3c-d52691b4dbfc