Use WS_POPUP for ash_unittests

ui/aura/root_window.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/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 128 matching lines @@
 RootWindow* RootWindow::GetForAcceleratedWidget(
     gfx::AcceleratedWidget widget) {
   return reinterpret_cast<RootWindow*>(
       ui::ViewProp::GetValue(widget, kRootWindowForAcceleratedWidget));
 }
 
 void RootWindow::Init() {
   compositor()->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(this),
                                 host_->GetBounds().size());
   Window::Init(ui::LAYER_NOT_DRAWN);
-
-  gfx::Point point;
-  if (host_->QueryMouseLocation(&point))
-    SetLastMouseLocation(this, ui::ConvertPointToDIP(layer(), point));
-
   compositor()->SetRootLayer(layer());
   SetBounds(
       ui::ConvertRectToDIP(layer(), gfx::Rect(host_->GetBounds().size())));
   Show();
 }
 
 void RootWindow::ShowRootWindow() {
   host_->Show();
 }
 
@@ skipping 876 matching lines @@
   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
                        orig_mouse_location,
                        orig_mouse_location,
                        ui::EF_IS_SYNTHESIZED);
   event.set_system_location(Env::GetInstance()->last_mouse_location());
   OnHostMouseEvent(&event);
 #endif
 }
 
 }  // namespace aura