Fix search engine import.
Fix search engine import.

If the user has installed and then uninstalled Chrome, but not deleted their user data directory, a subsequent install will silently import default search engines, thus possibly giving the user a fresh install of Chrome with default search engine not Google.

Fix: if the user has already set up a user data directory, don't import search engines.

BUG=none
TEST=import works for all the usual paths.  also, specifically: install and then uninstall Chrome without deleting user data directory.  set search engine in default browser to something other than Google. install Chrome again.  search engines should not be imported, but should be whatever the user had been previously using in Chrome.

Review URL: http://codereview.chromium.org/3315009

git-svn-id: http://src.chromium.org/svn/trunk/src@58391 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 44e65fd1a6ca7d23ba9ef675219743775fd0a2cb
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