Fixed crash when ANGLE returns a NULL device.
Fixed crash when ANGLE returns a NULL device.

ANGLE shouldn't be returning a NULL device at this point. I'll get to that next. This will fix crashes for people using old DX8 cards.

TEST=try
BUG=none

Review URL: http://codereview.chromium.org/3410018

git-svn-id: http://src.chromium.org/svn/trunk/src@59951 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6af69ce8e78074209379d736ab3f437482804470
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