Fix a crasher with "select file" dialogs.

views/widget/widget_win.cc

 // Copyright (c) 2009 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 "views/widget/widget_win.h"
 
 #include "app/l10n_util_win.h"
 #include "app/system_monitor.h"
 #include "app/win_util.h"
 #include "base/string_util.h"
@@ skipping 47 matching lines @@
       is_window_(false),
       restore_focus_when_enabled_(false),
       delegate_(NULL) {
 }
 
 WidgetWin::~WidgetWin() {
 }
 
 // static
 WidgetWin* WidgetWin::GetWidget(HWND hwnd) {
+  // TODO(jcivelli): http://crbug.com/44499 We need a way to test that hwnd is
+  //                 associated with a WidgetWin (it might be a pure
+  //                 WindowImpl).
+  if (!WindowImpl::IsWindowImpl(hwnd))
+    return NULL;
   return reinterpret_cast<WidgetWin*>(win_util::GetWindowUserData(hwnd));
 }
 
 // static
 WidgetWin* WidgetWin::GetRootWidget(HWND hwnd) {
   // First, check if the top-level window is a Widget.
   HWND root = ::GetAncestor(hwnd, GA_ROOT);
   if (!root)
     return NULL;
 
@@ skipping 1254 matching lines @@
 Widget* Widget::GetWidgetFromNativeWindow(gfx::NativeWindow native_window) {
   return Widget::GetWidgetFromNativeView(native_window);
 }
 
 // static
 void Widget::NotifyLocaleChanged() {
   NOTIMPLEMENTED();
 }
 
 }  // namespace views