Cleanup after removing views-mus code

ui/views/mus/mus_client.h

Index: ui/views/mus/mus_client.h
diff --git a/ui/views/mus/mus_client.h b/ui/views/mus/mus_client.h
index 34b2c33d1382698f2d4b398c2465dffeda0feb01..7817594a8fae7bcc07e7b58539d47689ee7742ea 100644
--- a/ui/views/mus/mus_client.h
+++ b/ui/views/mus/mus_client.h
@@ -50,7 +50,7 @@ class WMState;
 namespace views {
 
 class MusClientObserver;
-class PointerWatcherEventRouter2;
+class PointerWatcherEventRouter;
 class ScreenMus;
 
 namespace internal {
@@ -96,7 +96,7 @@ class VIEWS_MUS_EXPORT MusClient
     return window_tree_client_.get();
   }
 
-  PointerWatcherEventRouter2* pointer_watcher_event_router() {
+  PointerWatcherEventRouter* pointer_watcher_event_router() {
     return pointer_watcher_event_router_.get();
   }
 
@@ -153,7 +153,7 @@ class VIEWS_MUS_EXPORT MusClient
 
   std::unique_ptr<ui::Gpu> gpu_;
 
-  std::unique_ptr<PointerWatcherEventRouter2> pointer_watcher_event_router_;
+  std::unique_ptr<PointerWatcherEventRouter> pointer_watcher_event_router_;
 
   std::unique_ptr<aura::MusContextFactory> compositor_context_factory_;