Don't use browser windows for platform app shell windows

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 47cc23cada58ac3ca28fe5d1cd9044b62c742d61..b2f1970cb2ca065b94efd0ded6d86def50b522a2 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -1981,8 +1981,7 @@ void BrowserWindowGtk::ConnectAccelerators() {
 }
 
 void BrowserWindowGtk::UpdateCustomFrame() {
-  gtk_window_set_decorated(
-      window_, !UseCustomFrame() && browser_->type() != Browser::TYPE_SHELL);
+  gtk_window_set_decorated(window_, !UseCustomFrame());
   titlebar_->UpdateCustomFrame(UseCustomFrame() && !IsFullscreen());
   UpdateWindowShape(bounds_.width(), bounds_.height());
 }