Remove remaining calls to deprecated MessageLoop methods on Mac.

net/test/embedded_test_server/embedded_test_server_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 541 matching lines @@
 
     // Make a request and wait for the reply.
     if (!loop)
       loop.reset(new base::MessageLoopForIO);
 
     std::unique_ptr<URLFetcher> fetcher =
         URLFetcher::Create(server.GetURL("/test?q=foo"), URLFetcher::GET, this);
     fetcher->SetRequestContext(
         new TestURLRequestContextGetter(loop->task_runner()));
     fetcher->Start();
-    loop->Run();
+    base::RunLoop().Run();
     fetcher.reset();
 
     // Shut down.
     if (message_loop_present_on_shutdown_)
       loop.reset();
 
     ASSERT_TRUE(server.ShutdownAndWaitUntilComplete());
   }
 
   // URLFetcherDelegate override.
@@ skipping 24 matching lines @@
 INSTANTIATE_TEST_CASE_P(
     EmbeddedTestServerThreadingTestInstantiation,
     EmbeddedTestServerThreadingTest,
     testing::Combine(testing::Bool(),
                      testing::Bool(),
                      testing::Values(EmbeddedTestServer::TYPE_HTTP,
                                      EmbeddedTestServer::TYPE_HTTPS)));
 
 }  // namespace test_server
 }  // namespace net