x11: Move X event handling out of the message-pump.

ui/views/controls/menu/menu_message_pump_dispatcher_win.cc

Index: ui/views/controls/menu/menu_message_pump_dispatcher_win.cc
diff --git a/ui/views/controls/menu/menu_message_pump_dispatcher_win.cc b/ui/views/controls/menu/menu_message_pump_dispatcher_win.cc
index f49b53618a552f15078954131c8b2459698d5448..3fe74d36287e76a7fd18f941ede013487adf3775 100644
--- a/ui/views/controls/menu/menu_message_pump_dispatcher_win.cc
+++ b/ui/views/controls/menu/menu_message_pump_dispatcher_win.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/views/controls/menu/menu_message_pump_dispatcher.h"
+#include "ui/views/controls/menu/menu_message_pump_dispatcher_win.h"
 
 #include <windowsx.h>
 
@@ -14,6 +14,11 @@
 namespace views {
 namespace internal {
 
+MenuMessagePumpDispatcher::MenuMessagePumpDispatcher(MenuController* controller)
+    : menu_controller_(controller) {}
+
+MenuMessagePumpDispatcher::~MenuMessagePumpDispatcher() {}
+
 uint32_t MenuMessagePumpDispatcher::Dispatch(const MSG& msg) {
   DCHECK(menu_controller_->IsBlockingRun());