GTTF: Retry launching the browser a few times in UITest.
GTTF: Retry launching the browser a few times in UITest.

This should help us with some temporary bad conditions
on the bots. The browser shouldn't fail to start
three times in a row.

TEST=ui_tests
BUG=52746

Review URL: http://codereview.chromium.org/3126034

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@57897 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