Increase number of tries in CheckInternetZoneIdentifier.
Increase number of tries in CheckInternetZoneIdentifier.

Hopefully this will be enough to kill flakiness. But I'm afraid it'll require
some better solution in the end.

TEST=ui_tests
BUG=20809

Review URL: http://codereview.chromium.org/203033

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@26004 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