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

trunk/src/base/message_loop/message_pump_glib.h

Index: trunk/src/base/message_loop/message_pump_glib.h
===================================================================
--- trunk/src/base/message_loop/message_pump_glib.h	(revision 212951)
+++ trunk/src/base/message_loop/message_pump_glib.h	(working copy)
@@ -35,7 +35,6 @@
 class BASE_EXPORT MessagePumpGlib : public MessagePump {
  public:
   MessagePumpGlib();
-  virtual ~MessagePumpGlib();
 
   // Like MessagePump::Run, but events are routed through dispatcher.
   virtual void RunWithDispatcher(Delegate* delegate,
@@ -65,6 +64,8 @@
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) OVERRIDE;
 
  protected:
+  virtual ~MessagePumpGlib();
+
   // Returns the dispatcher for the current run state (|state_->dispatcher|).
   MessagePumpDispatcher* GetDispatcher();