Disable Firefox Importer tests again due to Purify report of leaks.
Disable Firefox Importer tests again due to Purify report of leaks.

Review URL: http://codereview.chromium.org/174414

git-svn-id: http://src.chromium.org/svn/trunk/src@24356 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d68469e3fe80eb087e8caf304feeaa61c51d57a7
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