Don't destroy the window in PlatformWindow's destructor.

ui/platform_window/win/win_window.cc

 // Copyright 2014 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/platform_window/win/win_window.h"
 
 #include "base/profiler/scoped_tracker.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/win/msg_util.h"
@@ skipping 31 matching lines @@
   CHECK(delegate_);
   if (use_popup_as_root_window_for_test)
     set_window_style(WS_POPUP);
   gfx::Rect window_bounds = GetWindowBoundsForClientBounds(
       WS_OVERLAPPEDWINDOW, window_ex_style(), bounds);
   gfx::WindowImpl::Init(NULL, window_bounds);
   SetWindowText(hwnd(), L"WinWindow");
 }
 
 WinWindow::~WinWindow() {
-  Destroy();
 }
 
 void WinWindow::Destroy() {
   if (IsWindow(hwnd()))
     DestroyWindow(hwnd());
 }
 
 void WinWindow::Show() {
   ShowWindow(hwnd(), SW_SHOWNORMAL);
 }
@@ skipping 151 matching lines @@
 
 namespace test {
 
 // static
 void SetUsePopupAsRootWindowForTest(bool use) {
   use_popup_as_root_window_for_test = use;
 }
 
 }  // namespace test
 }  // namespace ui