Remove most Sleeps from RedirectTest and wait properly.
Remove most Sleeps from RedirectTest and wait properly.

Not fixing any Top15 flakiness, but removes the ugly polling pattern
and prevents it from being copy-pasted into new tests.

TEST=Covered by ui_tests.
BUG=none

Review URL: http://codereview.chromium.org/183037

git-svn-id: http://src.chromium.org/svn/trunk/src@25176 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 916f035fbe83cfdb73269a1e73b7f8b80eaa31bf
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