Made MessagePump a non-thread safe class.

base/message_loop/message_pump_aurax11.h

Index: base/message_loop/message_pump_aurax11.h
diff --git a/base/message_loop/message_pump_aurax11.h b/base/message_loop/message_pump_aurax11.h
index f11b3b443e16609bd3098620428b36ea57064cc9..89089ad535cfc62b39fbf2d145ac8598e05d6cf8 100644
--- a/base/message_loop/message_pump_aurax11.h
+++ b/base/message_loop/message_pump_aurax11.h
@@ -35,6 +35,7 @@ class BASE_EXPORT MessagePumpAuraX11 : public MessagePumpGlib,
                                        public MessagePumpDispatcher {
  public:
   MessagePumpAuraX11();
+  virtual ~MessagePumpAuraX11();
 
   // Returns default X Display.
   static Display* GetDefaultXDisplay();
@@ -72,9 +73,6 @@ class BASE_EXPORT MessagePumpAuraX11 : public MessagePumpGlib,
   // functions which require a mapped window.
   void BlockUntilWindowMapped(unsigned long xid);
 
- protected:
-  virtual ~MessagePumpAuraX11();
-
  private:
   typedef std::map<unsigned long, MessagePumpDispatcher*> DispatchersMap;