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

ash/shelf/shelf_tooltip_manager.h

Index: ash/shelf/shelf_tooltip_manager.h
diff --git a/ash/shelf/shelf_tooltip_manager.h b/ash/shelf/shelf_tooltip_manager.h
index cccd7d3615fea46836156826ded5d2a4f935b027..390988ec1b87b1ac4d5da2f3350bdfe47ae10975 100644
--- a/ash/shelf/shelf_tooltip_manager.h
+++ b/ash/shelf/shelf_tooltip_manager.h
@@ -12,7 +12,7 @@
 #include "base/timer/timer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
-#include "ui/views/pointer_watcher.h"
+#include "ui/views/pointer_down_watcher.h"
 
 namespace views {
 class BubbleDialogDelegateView;
@@ -31,7 +31,7 @@ class ShelfViewTest;
 // ShelfTooltipManager manages the tooltip bubble that appears for shelf items.
 class ASH_EXPORT ShelfTooltipManager : public ui::EventHandler,
                                        public aura::WindowObserver,
-                                       public views::PointerWatcher,
+                                       public views::PointerDownWatcher,
                                        public ShelfLayoutManagerObserver {
  public:
   explicit ShelfTooltipManager(ShelfView* shelf_view);
@@ -63,7 +63,7 @@ class ASH_EXPORT ShelfTooltipManager : public ui::EventHandler,
   // aura::WindowObserver overrides:
   void OnWindowDestroying(aura::Window* window) override;
 
-  // views::PointerWatcher overrides:
+  // views::PointerDownWatcher overrides:
   void OnMousePressed(const ui::MouseEvent& event,
                       const gfx::Point& location_in_screen,
                       views::Widget* target) override;