events: Get rid of GestureStatus in favour of EventResult.

ui/aura/event_filter.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/aura/event_filter.h"
 
 #include "ui/aura/window.h"
 
 namespace aura {
 
 bool EventFilter::PreHandleKeyEvent(Window* target, ui::KeyEvent* event) {
   return false;
 }
 
 bool EventFilter::PreHandleMouseEvent(Window* target, ui::MouseEvent* event) {
   return false;
 }
 
 ui::TouchStatus EventFilter::PreHandleTouchEvent(Window* target,
                                                  ui::TouchEvent* event) {
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
-ui::GestureStatus EventFilter::PreHandleGestureEvent(Window* target,
-                                                     ui::GestureEvent* event) {
-  return ui::GESTURE_STATUS_UNKNOWN;
+ui::EventResult EventFilter::PreHandleGestureEvent(Window* target,
+                                                   ui::GestureEvent* event) {
+  return ui::ER_UNHANDLED;
 }
 
 ui::EventResult EventFilter::OnKeyEvent(ui::EventTarget* target,
                                         ui::KeyEvent* event) {
   return PreHandleKeyEvent(static_cast<Window*>(target), event) ?
       ui::ER_CONSUMED : ui::ER_UNHANDLED;
 }
 
 ui::EventResult EventFilter::OnMouseEvent(ui::EventTarget* target,
                                           ui::MouseEvent* event) {
   return PreHandleMouseEvent(static_cast<Window*>(target), event) ?
       ui::ER_CONSUMED : ui::ER_UNHANDLED;
 }
 
 ui::EventResult EventFilter::OnScrollEvent(ui::EventTarget* target,
                                            ui::ScrollEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
 ui::TouchStatus EventFilter::OnTouchEvent(ui::EventTarget* target,
                                           ui::TouchEvent* event) {
   return PreHandleTouchEvent(static_cast<Window*>(target), event);
 }
 
 ui::EventResult EventFilter::OnGestureEvent(ui::EventTarget* target,
                                             ui::GestureEvent* event) {
-  return PreHandleGestureEvent(static_cast<Window*>(target), event) ==
-      ui::GESTURE_STATUS_CONSUMED ? ui::ER_CONSUMED : ui::ER_UNHANDLED;
+  return PreHandleGestureEvent(static_cast<Window*>(target), event);
 }
 
 }  // namespace aura