Revert of Change ProxyResolver::GetProxyForURL() to take a scoped_ptr<Request>* rather than a RequestHandle*

net/proxy/proxy_resolver_v8_tracing.h

Index: net/proxy/proxy_resolver_v8_tracing.h
diff --git a/net/proxy/proxy_resolver_v8_tracing.h b/net/proxy/proxy_resolver_v8_tracing.h
index ecb1a76eee23380a0c35088c6f572d4a401edc43..f5f66cf7486797d0c6282f7dab361b2942cfa283 100644
--- a/net/proxy/proxy_resolver_v8_tracing.h
+++ b/net/proxy/proxy_resolver_v8_tracing.h
@@ -50,13 +50,20 @@
   // Gets a list of proxy servers to use for |url|. This request always
   // runs asynchronously and notifies the result by running |callback|. If the
   // result code is OK then the request was successful and |results| contains
-  // the proxy resolution information.  Request can be cancelled by resetting
-  // |*request|.
+  // the proxy resolution information. If |request| is non-null, |*request| is
+  // written to, and can be passed to CancelRequest().
   virtual void GetProxyForURL(const GURL& url,
                               ProxyInfo* results,
                               const CompletionCallback& callback,
-                              scoped_ptr<ProxyResolver::Request>* request,
+                              ProxyResolver::RequestHandle* request,
                               scoped_ptr<Bindings> bindings) = 0;
+
+  // Cancels |request|.
+  virtual void CancelRequest(ProxyResolver::RequestHandle request) = 0;
+
+  // Gets the LoadState for |request|.
+  virtual LoadState GetLoadState(
+      ProxyResolver::RequestHandle request) const = 0;
 };
 
 // A factory for ProxyResolverV8Tracing instances. The default implementation,