Fix silent import from file during install.
Fix silent import from file during install.

Regression was caused by changes made for
http://code.google.com/p/chromium/issues/detail?id=40975.
The change broke first run import 
http://code.google.com/p/chromium/issues/detail?id=41077.
A fix is made but there is a bug in the fix.

BUG=46763
TEST=mini_installer.exe --installerdata="path"


Review URL: http://codereview.chromium.org/2820014

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@50379 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