Delete the http_transaction_factory_ and http_auth_handler_factory_ pointers when the ChromeFrame request context is destroyed. 
Delete the http_transaction_factory_ and http_auth_handler_factory_ pointers when the ChromeFrame request context is
destroyed. 

Bug=55467

Review URL: http://codereview.chromium.org/3393002

git-svn-id: http://src.chromium.org/svn/trunk/src@59435 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9d343cdf56a612316cba13b7eadacbb6ac067df4
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