Make sure the key into the spdy session pool identifies the actual proxy used...

net/proxy/proxy_service.h

Index: net/proxy/proxy_service.h
===================================================================
--- net/proxy/proxy_service.h	(revision 57108)
+++ net/proxy/proxy_service.h	(working copy)
@@ -178,8 +178,16 @@
 
   // Creates a proxy service that always fails to fetch the proxy configuration,
   // so it falls back to direct connect.
+  // TODO(eroman): Rename to CreateDirect().
   static ProxyService* CreateNull();
 
+  // This method is used by tests to create a ProxyService that returns a
+  // hardcoded proxy fallback list (|pac_string|) for every URL.
+  //
+  // |pac_string| is a list of proxy servers, in the format that a PAC script
+  // would return it. For example, "PROXY foobar:99; SOCKS fml:2; DIRECT"
+  static ProxyService* CreateFixedFromPacResult(const std::string& pac_string);
+
   // Creates a config service appropriate for this platform that fetches the
   // system proxy settings.
   static ProxyConfigService* CreateSystemProxyConfigService(