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

base/message_loop.cc

Index: base/message_loop.cc
diff --git a/base/message_loop.cc b/base/message_loop.cc
index ca85d6a536c19da351324328c740ecc25d0c7979..c7efe32316528a644e44951fe2ad17825e1b234d 100644
--- a/base/message_loop.cc
+++ b/base/message_loop.cc
@@ -147,22 +147,13 @@ MessageLoop::MessageLoop(Type type)
 #elif defined(OS_MACOSX)
 #define MESSAGE_PUMP_UI base::MessagePumpMac::Create()
 #define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
-#elif defined(OS_ANDROID)
-#define MESSAGE_PUMP_UI new base::MessagePumpForUI()
-#define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
-#elif defined(USE_WAYLAND)
-#define MESSAGE_PUMP_UI new base::MessagePumpWayland()
-#define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
-#elif defined(USE_AURA)
-#define MESSAGE_PUMP_UI new base::MessagePumpX()
-#define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
 #elif defined(OS_NACL)
 // Currently NaCl doesn't have a UI or an IO MessageLoop.
 // TODO(abarth): Figure out if we need these.
 #define MESSAGE_PUMP_UI NULL
 #define MESSAGE_PUMP_IO NULL
 #elif defined(OS_POSIX)  // POSIX but not MACOSX.
-#define MESSAGE_PUMP_UI new base::MessagePumpGtk()
+#define MESSAGE_PUMP_UI new base::MessagePumpForUI()
 #define MESSAGE_PUMP_IO new base::MessagePumpLibevent()
 #else
 #error Not implemented