Introduce net::HttpServerPropertiesManager to manage server-specific properties.

jingle/notifier/base/proxy_resolving_client_socket.cc

Index: jingle/notifier/base/proxy_resolving_client_socket.cc
===================================================================
--- jingle/notifier/base/proxy_resolving_client_socket.cc	(revision 104660)
+++ jingle/notifier/base/proxy_resolving_client_socket.cc	(working copy)
@@ -56,6 +56,8 @@
   session_params.http_auth_handler_factory =
       request_context->http_auth_handler_factory();
   session_params.network_delegate = request_context->network_delegate();
+  session_params.http_server_properties =
+      request_context->http_server_properties();
   session_params.net_log = request_context->net_log();
   network_session_ = new net::HttpNetworkSession(session_params);
 }