Remove Owner param to EventFilter's ctor.

ui/aura/event_filter.h

Index: ui/aura/event_filter.h
===================================================================
--- ui/aura/event_filter.h	(revision 119894)
+++ ui/aura/event_filter.h	(working copy)
@@ -32,8 +32,7 @@
 // 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
@@ -58,14 +57,6 @@
   // 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