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: http://src.chromium.org/svn/trunk/src@50379 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 49c9a2b418dad70f428ed970b2591ae7a175475b
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