chromeos: Move files in //ash/common to //ash, part 3

ash/scoped_root_window_for_new_windows.cc

 // Copyright 2013 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/common/scoped_root_window_for_new_windows.h"
+#include "ash/scoped_root_window_for_new_windows.h"
 
-#include "ash/common/wm_shell.h"
+#include "ash/wm_shell.h"
 #include "base/logging.h"
 
 namespace ash {
 
 ScopedRootWindowForNewWindows::ScopedRootWindowForNewWindows(
     WmWindow* new_root) {
   DCHECK(new_root);
   WmShell::Get()->scoped_root_window_for_new_windows_ = new_root;
 }
 
 ScopedRootWindowForNewWindows::~ScopedRootWindowForNewWindows() {
   WmShell::Get()->scoped_root_window_for_new_windows_ = nullptr;
 }
 
 }  // namespace ash