Revert "Re-enable tab switching test."
Revert "Re-enable tab switching test."

Originally committed in r33997, still causing red on
vista interactive perf.

BUG=28968
TEST=tab switching test is disabled
TBR=ben

Review URL: http://codereview.chromium.org/467041

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@34007 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser