Remove calls to deprecated MessageLoop methods in chrome.

chrome/utility/importer/firefox_importer_unittest_utils_mac.cc

Index: chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
diff --git a/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc b/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
index 1468f8a4ef76e45c164e321ac011229260c4cee6..f4e8397f8d8bb4489be4b06498eda36c0cba2504 100644
--- a/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
+++ b/chrome/utility/importer/firefox_importer_unittest_utils_mac.cc
@@ -15,6 +15,7 @@
 #include "base/posix/global_descriptors.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ -292,7 +293,7 @@ MULTIPROCESS_IPC_TEST_MAIN(NSSDecrypterChildProcess) {
   listener.SetSender(channel.get());
 
   // run message loop
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
 
   return 0;
 }