Remove another redunant DCHECK that's taken to tripping.
Remove another redunant DCHECK that's taken to tripping.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/5274005

git-svn-id: http://src.chromium.org/svn/trunk/src@67476 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 33bcfbd5e8329edaeebd90ab4a09f61f016f1d91
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