Fixes crash in instant that would result if the preview page showed a popup.
Fixes crash in instant that would result if the preview page showed a
popup.

BUG=57361
TEST=see bug

Review URL: http://codereview.chromium.org/3536012

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@61600 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