Revert of mus: Rename .*PointerWatcher.* to .*PointerDownWatcher.*.

ui/views/pointer_down_watcher.h

-// Copyright 2016 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_VIEWS_POINTER_DOWN_WATCHER_H_
-#define UI_VIEWS_POINTER_DOWN_WATCHER_H_
-
-#include "base/macros.h"
-#include "ui/views/views_export.h"
-
-namespace gfx {
-class Point;
-}
-
-namespace ui {
-class MouseEvent;
-class TouchEvent;
-}
-
-namespace views {
-class Widget;
-
-// An interface for read-only observation of pointer events (in particular, the
-// events cannot be marked as handled). Only certain event types are supported.
-// The |target| is the top-level widget that will receive the event, if any.
-// NOTE: On mus this allows observation of events outside of windows owned
-// by the current process, in which case the |target| will be null. On mus
-// event.target() is always null.
-class VIEWS_EXPORT PointerDownWatcher {
- public:
-  PointerDownWatcher() {}
-  virtual void OnMousePressed(const ui::MouseEvent& event,
-                              const gfx::Point& location_in_screen,
-                              Widget* target) = 0;
-  virtual void OnTouchPressed(const ui::TouchEvent& event,
-                              const gfx::Point& location_in_screen,
-                              Widget* target) = 0;
-
- protected:
-  virtual ~PointerDownWatcher() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PointerDownWatcher);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_POINTER_DOWN_WATCHER_H_