Remove useless DesktopWindowTreeHostWin::HandleTooltipMouseMove()

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index acbef2b60820a32f2e22a45f852d0d75eb59f666..45f1a866ec75ea15ae0db47e2a7bec3dd634cb03 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -863,13 +863,6 @@ bool DesktopWindowTreeHostWin::HandleTooltipNotify(int w_param,
   return tooltip_ && tooltip_->HandleNotify(w_param, l_param, l_result);
 }
 
-void DesktopWindowTreeHostWin::HandleTooltipMouseMove(UINT message,
-                                                      WPARAM w_param,
-                                                      LPARAM l_param) {
-  // TooltipWin implementation doesn't need this.
-  // TODO(sky): remove from HWNDMessageHandler once non-aura path nuked.
-}
-
 void DesktopWindowTreeHostWin::HandleMenuLoop(bool in_menu_loop) {
   if (in_menu_loop) {
     tooltip_disabler_.reset(