Fixed detection of WS_OVERLAPPED windows, bug introduced in change 6561311.

ui/views/win/hwnd_message_handler.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/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <oleacc.h>
 #include <shellapi.h>
 #include <wtsapi32.h>
@@ skipping 853 matching lines @@
   fullscreen_handler()->SetFullscreen(fullscreen);
   // If we are out of fullscreen and there was a pending DWM transition for the
   // window, then go ahead and do it now.
   if (!fullscreen && dwm_transition_desired_)
     PerformDwmTransition();
 }
 
 void HWNDMessageHandler::SizeConstraintsChanged() {
   LONG style = GetWindowLong(hwnd(), GWL_STYLE);
   // Ignore if this is not a standard window.
-  if (!(style & WS_OVERLAPPED))
+  // WS_OVERLAPPED is just the *absence* of WS_POPUP and WS_CHILD.
+  if ((style & (WS_POPUP | WS_CHILD)) == WS_OVERLAPPED)
     return;
 
   if (delegate_->CanResize()) {
     style |= WS_THICKFRAME | WS_MAXIMIZEBOX;
     if (!delegate_->CanMaximize())
       style &= ~WS_MAXIMIZEBOX;
   } else {
     style &= ~(WS_THICKFRAME | WS_MAXIMIZEBOX);
   }
   if (delegate_->CanMinimize()) {
@@ skipping 1608 matching lines @@
     SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_HIDEWINDOW);
     SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_SHOWWINDOW);
   }
   // WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
   // to notify our children too, since we can have MDI child windows who need to
   // update their appearance.
   EnumChildWindows(hwnd(), &SendDwmCompositionChanged, NULL);
 }
 
 }  // namespace views