ash: Eliminate PointerWatcherDelegate

ash/mus/shell_delegate_mus.cc

Index: ash/mus/shell_delegate_mus.cc
diff --git a/ash/mus/shell_delegate_mus.cc b/ash/mus/shell_delegate_mus.cc
index d82d9baeb1e8cd69bdba9b9dafefe6fdeb7a65a0..285e1a7fc05ba109ee43bf4785d2e51a3d8834ff 100644
--- a/ash/mus/shell_delegate_mus.cc
+++ b/ash/mus/shell_delegate_mus.cc
@@ -9,7 +9,6 @@
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
 #include "ash/common/palette_delegate.h"
-#include "ash/common/pointer_watcher_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/system/tray/default_system_tray_delegate.h"
@@ -229,12 +228,6 @@ std::unique_ptr<PaletteDelegate> ShellDelegateMus::CreatePaletteDelegate() {
   return nullptr;
 }
 
-std::unique_ptr<PointerWatcherDelegate>
-ShellDelegateMus::CreatePointerWatcherDelegate() {
-  NOTIMPLEMENTED();
-  return nullptr;
-}
-
 ui::MenuModel* ShellDelegateMus::CreateContextMenu(WmShelf* wm_shelf,
                                                    const ShelfItem* item) {
   NOTIMPLEMENTED();