(repair leak) Handle synchronous request for a preconnection
(repair leak) Handle synchronous request for a preconnection

In some situations, the preconnection can be serviced
synchronously, and then there will be no callback
to release the Preconnect instance.  This change
properly handles that eventuality.

BUG=51133
r=wtc
Review URL: http://codereview.chromium.org/3115003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@55517 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