Clean up PrefServiceBuilder

chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc

Index: chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
index 40a9647fcb9136631f0e184f7004404c6dcf5cf2..e164538c3ff8567b858d56d19b133ecf04617b7f 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
@@ -341,8 +341,9 @@ class PrefProxyConfigTrackerImplCommandLineTest
         command_line_.AppendSwitch(name);
     }
     scoped_refptr<PrefRegistrySimple> registry = new PrefRegistrySimple;
-    pref_service_.reset(PrefServiceMockBuilder().WithCommandLine(&command_line_)
-                            .Create(registry.get()));
+    PrefServiceMockBuilder builder;
+    builder.SetCommandLine(&command_line_);
+    pref_service_ = builder.Create(registry.get()).Pass();
     Init(pref_service_.get(), registry.get());
   }