Use automatic memory management for URLRequestContext's members....

net/proxy/proxy_service.h

Index: net/proxy/proxy_service.h
===================================================================
--- net/proxy/proxy_service.h	(revision 6881)
+++ net/proxy/proxy_service.h	(working copy)
@@ -83,7 +83,7 @@
 // This class can be used to resolve the proxy server to use when loading a
 // HTTP(S) URL.  It uses the given ProxyResolver to handle the actual proxy
 // resolution.  See ProxyResolverWinHttp for example.
-class ProxyService {
+class ProxyService : public base::RefCounted<ProxyService> {
  public:
   // The instance takes ownership of |resolver|.
   explicit ProxyService(ProxyResolver* resolver);
@@ -138,6 +138,10 @@
   // use IE's settings).
   static ProxyService* Create(const ProxyInfo* pi);
 
+  // Create a ProxyService which fails every request, causing fallback to a
+  // direct connection. Convenience function used by unit tests.
+  static ProxyService* CreateNull();
+
   // TODO(eroman): remove once WinHTTP is gone.
   // Get the ProxyInfo used to create this proxy service (only used by WinHTTP).
   const ProxyInfo* proxy_info() const {