Remove calls to deprecated MessageLoop methods in base.

base/threading/thread.cc

Index: base/threading/thread.cc
diff --git a/base/threading/thread.cc b/base/threading/thread.cc
index 10e7206b5c0e1778ee7dc17bbc32634cd0bbfce0..11aaea1d7f8af1e4dac805f4e60be34b74d9456b 100644
--- a/base/threading/thread.cc
+++ b/base/threading/thread.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
+#include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_id_name_manager.h"
@@ -201,7 +202,7 @@ bool Thread::IsRunning() const {
 }
 
 void Thread::Run(MessageLoop* message_loop) {
-  message_loop->Run();
+  RunLoop().Run();
 }
 
 void Thread::SetThreadWasQuitProperly(bool flag) {