mash: Migrate ScopedTargetRootWindow to //ash/common

ash/common/wm/container_finder.cc

 // Copyright 2016 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/wm/container_finder.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/always_on_top_controller.h"
 #include "ash/common/wm/root_window_finder.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_root_window_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ash {
 namespace wm {
 namespace {
 
 WmWindow* FindContainerRoot(WmShell* shell, const gfx::Rect& bounds) {
   if (bounds == gfx::Rect())
-    return shell->GetRootWindowForNewWindows();
+    return shell->root_window_for_new_windows();
   return GetRootWindowMatching(bounds);
 }
 
 bool HasTransientParentWindow(const WmWindow* window) {
   return window->GetTransientParent() &&
          window->GetTransientParent()->GetType() != ui::wm::WINDOW_TYPE_UNKNOWN;
 }
 
 WmWindow* GetSystemModalContainer(WmWindow* root, WmWindow* window) {
   DCHECK(window->IsSystemModal());
@@ skipping 68 matching lines @@
     default:
       NOTREACHED() << "Window " << window->GetShellWindowId()
                    << " has unhandled type " << window->GetType();
       break;
   }
   return nullptr;
 }
 
 }  // namespace wm
 }  // namespace ash