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

ash/sysui/pointer_watcher_delegate_mus.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 ASH_SYSUI_POINTER_WATCHER_DELEGATE_MUS_H_
+#define ASH_SYSUI_POINTER_WATCHER_DELEGATE_MUS_H_
+
+#include "ash/common/pointer_watcher_delegate.h"
+#include "base/macros.h"
+
+namespace ash {
+
+// PointerWatcher support on mus via the WindowManagerConnection.
+class PointerWatcherDelegateMus : public PointerWatcherDelegate {
+ public:
+  PointerWatcherDelegateMus();
+  ~PointerWatcherDelegateMus() override;
+
+  // PointerWatcherDelegate:
+  void AddPointerWatcher(views::PointerWatcher* watcher) override;
+  void RemovePointerWatcher(views::PointerWatcher* watcher) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PointerWatcherDelegateMus);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSUI_POINTER_WATCHER_DELEGATE_MUS_H_