Remove Owner param to EventFilter's ctor.

ui/aura/event_filter.h

 // 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.
 
 #ifndef UI_AURA_EVENT_FILTER_H_
 #define UI_AURA_EVENT_FILTER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "ui/aura/aura_export.h"
@@ skipping 14 matching lines @@
 // the event, this is typically the visible window whose bounds most tightly
 // enclose the event coordinates, in the case of mouse events, or the focused
 // window, in the case of key events.
 //
 // The Desktop then walks up the hierarchy from the target to its own window,
 // collecting a list of EventFilters. This list is notified in reverse order
 // (i.e. descending, from the Desktop's own event filter). Each filter gets a
 // chance to prevent further processing of the event and/or take other actions.
 class AURA_EXPORT EventFilter {
  public:
-  explicit EventFilter(Window* owner);
-  virtual ~EventFilter();
+  virtual ~EventFilter() {}
 
   // Parameters: a |target| Window and the |event|. The target window is the
   // window the event was targeted at. If |event| is a LocatedEvent, its
   // coordinates are relative to |target|.
 
   // For all PreHandle*() functions that return a bool, return true if the
   // filter consumes the event and further processing (by the target, for
   // example) is not performed. Return false if the filter does not consume the
   // event and further processing is performed. Note that in this case the
   // filter may still perform some action, the return value simply indicates
   // that further processing can occur.
 
   virtual bool PreHandleKeyEvent(Window* target, KeyEvent* event) = 0;
   virtual bool PreHandleMouseEvent(Window* target, MouseEvent* event) = 0;
 
   // Returns a value other than ui::TOUCH_STATUS_UNKNOWN if the event is
   // consumed.
   virtual ui::TouchStatus PreHandleTouchEvent(Window* target,
                                               TouchEvent* event) = 0;
 
   // Returns a value other than ui::GESTURE_STATUS_UNKNOWN if the gesture is
   // consumed.
   virtual ui::GestureStatus PreHandleGestureEvent(Window* target,
                                                   GestureEvent* event) = 0;
-
- protected:
-  Window* owner() { return owner_; }
-
- private:
-  Window* owner_;
-
-  DISALLOW_COPY_AND_ASSIGN(EventFilter);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_EVENT_FILTER_H_