Refactor MessagePumpX to dispatch events inside of the source Dispatch function.

base/message_pump_gtk.h

Index: base/message_pump_gtk.h
diff --git a/base/message_pump_gtk.h b/base/message_pump_gtk.h
index 80122ce8fe4b706121d201ea5c4a0de59b82d7ec..ea1630f06f2659dd1baae6f05ea938dc4934708d 100644
--- a/base/message_pump_gtk.h
+++ b/base/message_pump_gtk.h
@@ -54,9 +54,6 @@ class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib {
   static Display* GetDefaultXDisplay();
 
  private:
-  // Overridden from MessagePumpGlib
-  virtual bool RunOnce(GMainContext* context, bool block) OVERRIDE;
-
   // Invoked from EventDispatcher. Notifies all observers we're about to
   // process an event.
   void WillProcessEvent(GdkEvent* event);