Unreviewed, rolling out r100308.

Unreviewed, rolling out r100308.
http://trac.webkit.org/changeset/100308
https://bugs.webkit.org/show_bug.cgi?id=72450

Introduces WebGL conformance test regressions. (Requested by
twiz on #webkit).

Patch by Sheriff Bot <webkit.review.bot@gmail.com> on 2011-11-15

* html/canvas/WebGLRenderingContext.cpp:
(WebCore::WebGLRenderingContext::copyTexImage2D):
(WebCore::WebGLRenderingContext::copyTexSubImage2D):
(WebCore::WebGLRenderingContext::readPixels):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@100394 268f45cc-cd09-0410-ab3c-d52691b4dbfc