Convert to *WindowLongPtr functions for Win64 compatability

chrome/browser/ui/views/panels/panel_stack_view.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/ui/views/panels/panel_stack_view.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/panels/panel.h"
@@ skipping 174 matching lines @@
   // the taskbar. In order for multiple stacked panels to appear as one, this
   // bit needs to be cleared.
   int value = ::GetWindowLong(panel_window, GWL_EXSTYLE);
   ::SetWindowLong(
       panel_window,
       GWL_EXSTYLE,
       stack_window ? (value & ~WS_EX_APPWINDOW) : (value | WS_EX_APPWINDOW));
 
   // All the windows that share the same owner window will appear as a single
   // window on the taskbar.
-  ::SetWindowLong(panel_window,
-                  GWL_HWNDPARENT,
-                  reinterpret_cast<LONG>(stack_window));
+  ::SetWindowLongPtr(panel_window,
+                     GWLP_HWNDPARENT,
+                     reinterpret_cast<LONG>(stack_window));
 
 #else
   NOTIMPLEMENTED();
 #endif
 }