Fixes crash in closing menus. There are two issues here:

ui/views/widget/native_widget_win.cc

 // 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.
 
 #include "ui/views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 303 matching lines @@
 
 // Links the HWND to its NativeWidget.
 const char* const kNativeWidgetKey = "__VIEWS_NATIVE_WIDGET__";
 
 // A custom MSAA object id used to determine if a screen reader is actively
 // listening for MSAA events.
 const int kCustomObjectID = 1;
 
 const int kDragFrameWindowAlpha = 200;
 
+struct FindOwnedWindowsData {
+  HWND window;
+  std::vector<Widget*> owned_widgets;
+};
+
+BOOL CALLBACK FindOwnedWindowsCallback(HWND hwnd, LPARAM param) {
+  FindOwnedWindowsData* data = reinterpret_cast<FindOwnedWindowsData*>(param);
+  if (GetWindow(hwnd, GW_OWNER) == data->window) {
+    Widget* widget = Widget::GetWidgetForNativeView(hwnd);
+    if (widget)
+      data->owned_widgets.push_back(widget);
+  }
+  return TRUE;
+}
+
 }  // namespace
 
 // static
 bool NativeWidgetWin::screen_reader_active_ = false;
 
 // A scoping class that prevents a window from being able to redraw in response
 // to invalidations that may occur within it for the lifetime of the object.
 //
 // Why would we want such a thing? Well, it turns out Windows has some
 // "unorthodox" behavior when it comes to painting its non-client areas.
@@ skipping 550 matching lines @@
 
 void NativeWidgetWin::Hide() {
   if (IsWindow()) {
     // NOTE: Be careful not to activate any windows here (for example, calling
     // ShowWindow(SW_HIDE) will automatically activate another window).  This
     // code can be called while a window is being deactivated, and activating
     // another window will screw up the activation that is already in progress.
     SetWindowPos(NULL, 0, 0, 0, 0,
                  SWP_HIDEWINDOW | SWP_NOACTIVATE | SWP_NOMOVE |
                  SWP_NOREPOSITION | SWP_NOSIZE | SWP_NOZORDER);
+
+    if (!GetParent())
+      NotifyOwnedWindowsParentClosing();

[oshima, 2012/04/26 03:05:27]

Can a widget be closed by Windows?

[sky, 2012/04/26 03:54:53]

Do you mean can windows close out from under us? Yes. There is nothing stopping
windows or another app from closing an app window.

   }
 }
 
 void NativeWidgetWin::ShowMaximizedWithBounds(
     const gfx::Rect& restored_bounds) {
   WINDOWPLACEMENT placement = { 0 };
   placement.length = sizeof(WINDOWPLACEMENT);
   placement.showCmd = SW_SHOWMAXIMIZED;
   placement.rcNormalPosition = restored_bounds.ToRECT();
   SetWindowPlacement(hwnd(), &placement);
@@ skipping 1575 matching lines @@
     // If we were run modally, we need to undo the disabled-ness we inflicted on
     // the owner's parent hierarchy.
     HWND start = ::GetWindow(GetNativeView(), GW_OWNER);
     while (start) {
       ::EnableWindow(start, TRUE);
       start = ::GetParent(start);
     }
   }
 }
 
+void NativeWidgetWin::NotifyOwnedWindowsParentClosing() {
+  FindOwnedWindowsData data;
+  data.window = hwnd();
+  EnumThreadWindows(GetCurrentThreadId(), FindOwnedWindowsCallback,
+                    reinterpret_cast<LPARAM>(&data));
+  for (size_t i = 0; i < data.owned_widgets.size(); ++i)
+    data.owned_widgets[i]->OnOwnedParentClosing();
+}
+
 void NativeWidgetWin::DispatchKeyEventPostIME(const KeyEvent& key) {
   SetMsgHandled(delegate_->OnKeyEvent(key));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, public:
 
 // static
 void Widget::NotifyLocaleChanged() {
   NOTIMPLEMENTED();
@@ skipping 147 matching lines @@
   return (GetKeyState(VK_LBUTTON) & 0x80) ||
     (GetKeyState(VK_RBUTTON) & 0x80) ||
     (GetKeyState(VK_MBUTTON) & 0x80) ||
     (GetKeyState(VK_XBUTTON1) & 0x80) ||
     (GetKeyState(VK_XBUTTON2) & 0x80);
 }
 
 }  // namespace internal
 
 }  // namespace views