This will disable the behavior on Windows 10 in which

ui/views/win/hwnd_message_handler.h

 // Copyright (c) 2012 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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 #include <stddef.h>
 
@@ skipping 319 matching lines @@
 
     // Non-atlcrack.h handlers
     CR_MESSAGE_HANDLER_EX(WM_GETOBJECT, OnGetObject)
 
     // Mouse events.
     CR_MESSAGE_HANDLER_EX(WM_MOUSEACTIVATE, OnMouseActivate)
     CR_MESSAGE_HANDLER_EX(WM_MOUSELEAVE, OnMouseRange)
     CR_MESSAGE_HANDLER_EX(WM_NCMOUSELEAVE, OnMouseRange)
     CR_MESSAGE_HANDLER_EX(WM_SETCURSOR, OnSetCursor);
 
+    // Pointer events.
+    CR_MESSAGE_HANDLER_EX(WM_POINTERACTIVATE, OnPointerActivate)
+
     // Key events.
     CR_MESSAGE_HANDLER_EX(WM_KEYDOWN, OnKeyEvent)
     CR_MESSAGE_HANDLER_EX(WM_KEYUP, OnKeyEvent)
     CR_MESSAGE_HANDLER_EX(WM_SYSKEYDOWN, OnKeyEvent)
     CR_MESSAGE_HANDLER_EX(WM_SYSKEYUP, OnKeyEvent)
 
     // IME Events.
     CR_MESSAGE_HANDLER_EX(WM_IME_SETCONTEXT, OnImeMessages)
     CR_MESSAGE_HANDLER_EX(WM_IME_STARTCOMPOSITION, OnImeMessages)
     CR_MESSAGE_HANDLER_EX(WM_IME_COMPOSITION, OnImeMessages)
@@ skipping 75 matching lines @@
   void OnExitSizeMove();
   void OnGetMinMaxInfo(MINMAXINFO* minmax_info);
   LRESULT OnGetObject(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnImeMessages(UINT message, WPARAM w_param, LPARAM l_param);
   void OnInitMenu(HMENU menu);
   void OnInputLangChange(DWORD character_set, HKL input_language_id);
   LRESULT OnKeyEvent(UINT message, WPARAM w_param, LPARAM l_param);
   void OnKillFocus(HWND focused_window);
   LRESULT OnMouseActivate(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnMouseRange(UINT message, WPARAM w_param, LPARAM l_param);
+  LRESULT OnPointerActivate(UINT message, WPARAM w_param, LPARAM l_param);
   void OnMove(const gfx::Point& point);
   void OnMoving(UINT param, const RECT* new_bounds);
   LRESULT OnNCActivate(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnNCCalcSize(BOOL mode, LPARAM l_param);
   LRESULT OnNCHitTest(const gfx::Point& point);
   void OnNCPaint(HRGN rgn);
   LRESULT OnNCUAHDrawCaption(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnNCUAHDrawFrame(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnNotify(int w_param, NMHDR* l_param);
   void OnPaint(HDC dc);
@@ skipping 208 matching lines @@
 
   // The factory used with BEGIN_SAFE_MSG_MAP_EX.
   base::WeakPtrFactory<HWNDMessageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_