wayland: use message_pump_observer common code

base/message_pump_wayland.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_pump_wayland.h"
 
 #include <glib.h>
 
 namespace base {
 
 MessagePumpWayland::MessagePumpWayland()
     : MessagePumpGlib(),
       context_(g_main_context_default()) {
 }
 
 MessagePumpWayland::~MessagePumpWayland() {
 }
 
 bool MessagePumpWayland::RunOnce(GMainContext* context, bool block) {
   // g_main_context_iteration returns true if events have been dispatched.
   return g_main_context_iteration(context, block);
 }
 
-MessagePumpObserver::EventStatus
-    MessagePumpObserver::WillProcessEvent(wayland::WaylandEvent* event) {
-  return EVENT_CONTINUE;
-}
-
 }  // namespace base