Fix simple_database_system.cc to correctly support temp DB files.
Fix simple_database_system.cc to correctly support temp DB files.

TEST=none
BUG=42618

Review URL: http://codereview.chromium.org/1709014

git-svn-id: http://src.chromium.org/svn/trunk/src@45753 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 454f63cb9aeb52da0eac190eeb49697f883c2489
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