Remove calls to deprecated MessageLoop methods in net.

net/test/embedded_test_server/embedded_test_server_unittest.cc

Index: net/test/embedded_test_server/embedded_test_server_unittest.cc
diff --git a/net/test/embedded_test_server/embedded_test_server_unittest.cc b/net/test/embedded_test_server/embedded_test_server_unittest.cc
index d3a103199622c351847afbd29bed93dff61d2656..1949ee366d8e6b043a46ec306d1bafda303d784a 100644
--- a/net/test/embedded_test_server/embedded_test_server_unittest.cc
+++ b/net/test/embedded_test_server/embedded_test_server_unittest.cc
@@ -163,7 +163,7 @@ class EmbeddedTestServerTest
     num_responses_received_ = 0;
     num_responses_expected_ = num_responses;
     // Will be terminated in OnURLFetchComplete().
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
   }
 
   // Handles |request| sent to |path| and returns the response per |content|,