aura: Unify WindowTreeHost for some platforms

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/strings/string16.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/win/msg_util.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
 
+// static
+scoped_ptr<PlatformWindow> PlatformWindow::Create(
+    PlatformWindowDelegate* delegate,
+    const gfx::Rect& bounds) {
+  return new WinWindow(delegate, bounds);
+}
+
 namespace {
 
 bool use_popup_as_root_window_for_test = false;
 
 gfx::Rect GetWindowBoundsForClientBounds(DWORD style, DWORD ex_style,
                                          const gfx::Rect& bounds) {
   RECT wr;
   wr.left = bounds.x();
   wr.top = bounds.y();
   wr.right = bounds.x() + bounds.width();
@@ skipping 161 matching lines @@
 
 namespace test {
 
 // static
 void SetUsePopupAsRootWindowForTest(bool use) {
   use_popup_as_root_window_for_test = use;
 }
 
 }  // namespace test
 }  // namespace ui