Revert of base: Remove use of MessageLoopProxy

base/test/task_runner_test_template.h

Index: base/test/task_runner_test_template.h
diff --git a/base/test/task_runner_test_template.h b/base/test/task_runner_test_template.h
index ee2b876671ffbe642413d4b487e4b87ff1a46131..9bcf70ba3bbcbf1e5f13996e35fd184401828199 100644
--- a/base/test/task_runner_test_template.h
+++ b/base/test/task_runner_test_template.h
@@ -53,9 +53,7 @@
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/location.h"
 #include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/synchronization/lock.h"
 #include "base/task_runner.h"
@@ -197,7 +195,7 @@
             i);
     for (int j = 0; j < i + 1; ++j) {
       task_runner->PostTask(FROM_HERE, ith_task_runner_task);
-      thread.task_runner()->PostTask(FROM_HERE, ith_non_task_runner_task);
+      thread.message_loop()->PostTask(FROM_HERE, ith_non_task_runner_task);
       expected_task_run_counts[i] += 2;
     }
   }