Remove root window from screen_ash

ash/shell.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 "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/focus_manager_factory.h"
@@ skipping 545 matching lines @@
 
 internal::WorkspaceController* Shell::TestApi::workspace_controller() {
   return shell_->workspace_controller_.get();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, public:
 
 Shell::Shell(ShellDelegate* delegate)
     : root_window_(aura::MonitorManager::CreateRootWindowForPrimaryMonitor()),
-      screen_(new ScreenAsh(root_window_.get())),
+      screen_(new ScreenAsh),
       env_filter_(NULL),
       delegate_(delegate),
 #if defined(OS_CHROMEOS)
       output_configurator_(new chromeos::OutputConfigurator()),
 #endif  // defined(OS_CHROMEOS)
       shelf_(NULL),
       panel_layout_manager_(NULL),
       root_window_layout_(NULL),
       status_area_widget_(NULL),
       browser_context_(NULL) {
@@ skipping 502 matching lines @@
 void Shell::SetCursor(gfx::NativeCursor cursor) {
   // TODO(oshima): set cursor to all root windows.
   GetPrimaryRootWindow()->SetCursor(cursor);
 }
 
 void Shell::ShowCursor(bool visible) {
   GetPrimaryRootWindow()->ShowCursor(visible);
 }
 
 }  // namespace ash