Made MessagePump a non-thread safe class.

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index 504c8e30b6b72c7093ea211469c82306dbe5eeba..7aef226ee391c613e9ed5e6fbbee79fccddd05a5 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_loop_proxy_impl.h"
 #include "base/pending_task.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/run_loop.h"
@@ -32,10 +33,10 @@ class MessageLoopLockTest {
                              WaitableEvent* caller_wait,
                              WaitableEvent* caller_signal) {
 
-    loop->incoming_queue_lock_.Acquire();
+    loop->message_loop_proxy_->message_loop_lock_.Acquire();
     caller_wait->Signal();
     caller_signal->Wait();
-    loop->incoming_queue_lock_.Release();
+    loop->message_loop_proxy_->message_loop_lock_.Release();
   }
 };