events: Start changing EventHandler interface to not return a value.

ui/views/corewm/focus_change_shim.cc

 // Copyright (c) 2012 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 "ui/views/corewm/focus_change_shim.h"
 
 #include "base/command_line.h"
 #include "ui/aura/window.h"
 #include "ui/base/events/event_target.h"
 #include "ui/views/corewm/corewm_switches.h"
@@ skipping 15 matching lines @@
 }
 
 FocusChangeShim::~FocusChangeShim() {
   if (UseFocusController() && target_)
     target_->RemovePreTargetHandler(this);
 }
 
 void FocusChangeShim::OnWindowFocused(aura::Window* window) {
 }
 
-ui::EventResult FocusChangeShim::OnEvent(ui::Event* event) {
+void FocusChangeShim::OnEvent(ui::Event* event) {
   if (event->type() == FocusChangeEvent::focus_changed_event_type()) {
     DCHECK(UseFocusController());
     OnWindowFocused(static_cast<aura::Window*>(event->target()));
   }
-  return EventHandler::OnEvent(event);
+  EventHandler::OnEvent(event);
 }
 
 }  // namespace corewm
 }  // namespace views