Fixing the flakiness of a couple of popups tests.
Fixing the flakiness of a couple of popups tests.

Enabling the test popups.PopupsTest.testPopupBlockerInIncognito

BUG=70659
TEST=popups.PopupsTest.testPopupBlockerInIncognito and popups.PopupsTest.testLaunchBlockedPopupInIncognito should pass on Linux pyauto bot
Review URL: http://codereview.chromium.org/6853002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@81771 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