Change a DCHECK to CHECK to help debug a crash in release builds.
Change a DCHECK to CHECK to help debug a crash in
release builds.

R=eroman
BUG=4749
Review URL: http://codereview.chromium.org/12465

git-svn-id: http://src.chromium.org/svn/trunk/src@6189 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 52998e5cb490e5f22fa9f4e7b1dbb5204360c3bc
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