Aura/ash split: Don't use X11 window borders.

ui/views/widget/desktop_native_widget_helper_aura.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/widget/desktop_native_widget_helper_aura.h"
 
 #include "ui/aura/root_window.h"
 #include "ui/aura/desktop/desktop_activation_client.h"
 #include "ui/aura/desktop/desktop_dispatcher_client.h"
 #include "ui/aura/desktop/desktop_root_window_event_filter.h"
@@ skipping 34 matching lines @@
   if (bounds.IsEmpty()) {
     // We must pass some non-zero value when we initialize a RootWindow. This
     // will probably be SetBounds()ed soon.
     bounds.set_size(gfx::Size(100, 100));
   }
   root_window_.reset(new aura::RootWindow(bounds));
   root_window_->Init();
   root_window_->SetEventFilter(
       new aura::DesktopRootWindowEventFilter(root_window_.get()));
   root_window_->AddRootWindowObserver(this);
+  root_window_->SetUseOSWindowBorders(false);
 
   aura::client::SetActivationClient(
       root_window_.get(),
       new aura::DesktopActivationClient(root_window_.get()));
   aura::client::SetDispatcherClient(root_window_.get(),
                                     new aura::DesktopDispatcherClient);
 }
 
 void DesktopNativeWidgetHelperAura::PostInitialize() {
 #if defined(OS_WIN)
@@ skipping 56 matching lines @@
   widget_->SetBounds(gfx::Rect(root->GetHostSize()));
 }
 
 void DesktopNativeWidgetHelperAura::OnRootWindowHostClosed(
     const aura::RootWindow* root) {
   DCHECK_EQ(root, root_window_.get());
   widget_->GetWidget()->Close();
 }
 
 }  // namespace views