Add WebSocket handshake support to UrlRequestHttpJob, by supporting ws: and wss: protocols and passing the WebSocketStreamFactory through to HttpNetworkTransaction.

BUG=315027
TEST=net_unittests --gtest_filter=URLRequestHttpJob*

Review URL: https://codereview.chromium.org/23500007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237751 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237751