Add ProxyResolverFactoryV8Tracing.

net/proxy/proxy_service_v8.cc

Index: net/proxy/proxy_service_v8.cc
diff --git a/net/proxy/proxy_service_v8.cc b/net/proxy/proxy_service_v8.cc
index eac36ec0e3b0cbc576411943c4c83f09c6ae56bd..0ddcf729e29421159b8490294b91a2227babd52e 100644
--- a/net/proxy/proxy_service_v8.cc
+++ b/net/proxy/proxy_service_v8.cc
@@ -15,29 +15,25 @@
 namespace net {
 namespace {
 
-class ProxyResolverFactoryForV8Resolver : public LegacyProxyResolverFactory {
+class ProxyResolverFactoryForV8Resolver : public ProxyResolverFactoryV8Tracing {
  public:
   explicit ProxyResolverFactoryForV8Resolver(HostResolver* host_resolver,
                                              NetLog* net_log,
                                              NetworkDelegate* network_delegate)
-      : LegacyProxyResolverFactory(true),
-        host_resolver_(host_resolver),
-        net_log_(net_log),
+      : ProxyResolverFactoryV8Tracing(
+            host_resolver,
+            net_log,
+            ProxyResolver::LoadStateChangedCallback()),
         network_delegate_(network_delegate) {}
 
-  // LegacyProxyResolverFactory override.
-  scoped_ptr<ProxyResolver> CreateProxyResolver() override {
+  // ProxyResolverFactory override.
+  scoped_ptr<ProxyResolverErrorObserver> CreateErrorObserver() override {
     DCHECK(thread_checker_.CalledOnValidThread());
-    ProxyResolverErrorObserver* error_observer =
-        new NetworkDelegateErrorObserver(
-            network_delegate_, base::MessageLoopProxy::current().get());
-    return make_scoped_ptr(
-        new ProxyResolverV8Tracing(host_resolver_, error_observer, net_log_));
+    return make_scoped_ptr(new NetworkDelegateErrorObserver(
+        network_delegate_, base::MessageLoopProxy::current().get()));
   }
 
  private:
-  HostResolver* const host_resolver_;
-  NetLog* const net_log_;
   NetworkDelegate* const network_delegate_;
 
   base::ThreadChecker thread_checker_;