Fix DatabaseTracker::LazyInit() to open the tracker database only once.
Fix DatabaseTracker::LazyInit() to open the tracker database only
once.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/397023

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@32155 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