events: Update mouse-event handlers to not return EventResult.

ui/views/corewm/focus_controller.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_controller.h"
 
 #include "base/auto_reset.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ skipping 134 matching lines @@
   //NOTREACHED();
   // This method is only for compat with aura::FocusManager. It should not be
   // needed in the new FocusController.
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // FocusController, ui::EventHandler implementation:
 void FocusController::OnKeyEvent(ui::KeyEvent* event) {
 }
 
-ui::EventResult FocusController::OnMouseEvent(ui::MouseEvent* event) {
+void FocusController::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSE_PRESSED)
     WindowFocusedFromInputEvent(static_cast<aura::Window*>(event->target()));
-  return ui::ER_UNHANDLED;
 }
 
 void FocusController::OnScrollEvent(ui::ScrollEvent* event) {
 }
 
 void FocusController::OnTouchEvent(ui::TouchEvent* event) {
 }
 
 void FocusController::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_BEGIN &&
@@ skipping 108 matching lines @@
     SetFocusedWindow(rules_->GetNextFocusableWindow(window));
   }
 }
 
 void FocusController::WindowFocusedFromInputEvent(aura::Window* window) {
   FocusWindow(window, NULL);
 }
 
 }  // namespace corewm
 }  // namespace views