Revert 212948 "Made MessagePump a non-thread safe class."

trunk/src/base/message_loop/message_pump_aurax11.h

Index: trunk/src/base/message_loop/message_pump_aurax11.h
===================================================================
--- trunk/src/base/message_loop/message_pump_aurax11.h	(revision 212951)
+++ trunk/src/base/message_loop/message_pump_aurax11.h	(working copy)
@@ -35,7 +35,6 @@
                                        public MessagePumpDispatcher {
  public:
   MessagePumpAuraX11();
-  virtual ~MessagePumpAuraX11();
 
   // Returns default X Display.
   static Display* GetDefaultXDisplay();
@@ -73,6 +72,9 @@
   // functions which require a mapped window.
   void BlockUntilWindowMapped(unsigned long xid);
 
+ protected:
+  virtual ~MessagePumpAuraX11();
+
  private:
   typedef std::map<unsigned long, MessagePumpDispatcher*> DispatchersMap;