Revert 44049 - Enable blank document checks in dom checker.
Revert 44049 - Enable blank document checks in dom checker.

Broke dom_checker_tests on Chromium Linux and Chromium Linux x64.

BUG=9394
Test=DomCheckerTest
Review URL: http://codereview.chromium.org/1609015

TBR=inferno@chromium.org
Review URL: http://codereview.chromium.org/1627013

git-svn-id: http://src.chromium.org/svn/trunk/src@44053 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 0d207b203ebd4954ef6b6cb50266c86d2f1acbf0
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