Fix a typo in UrlmonUrlRequest to clear the map during shutdown
Fix a typo in UrlmonUrlRequest to clear the map during shutdown

In UrlmonUrlRequestManager::StopAll we meant to clear the map but
used map.empty() instead of map.clear().

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/5656004

git-svn-id: http://src.chromium.org/svn/trunk/src@68649 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a4ac5507f4e3da15d38539dda0d2146a2ae18140
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