Add ObserverListThreadSafeTest.CrossThreadObserver to skipped tests.
Add ObserverListThreadSafeTest.CrossThreadObserver to skipped tests.

BUG=7477

Review URL: http://codereview.chromium.org/20152

git-svn-id: http://src.chromium.org/svn/trunk/src@9363 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e53bd2a22781ecfaecef3e4f231ba208781deb04
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