ContextGroup::Initialize fails on insufficient vertex attribs or texture units.
ContextGroup::Initialize fails on insufficient vertex attribs or texture units.

It was an assertion before but these are legitimate runtime errors.

TEST=try, gpu unit tests locally
BUG=none

Review URL: http://codereview.chromium.org/3027047

git-svn-id: http://src.chromium.org/svn/trunk/src@55463 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a9a5022a0ae9930adc063ecc595cd1993bddc330
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser