cros: Remove OS_CHROMEOS ifdefs in ash/common

ash/common/wm_root_window_controller.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_root_window_controller.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_layout_manager.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 436 matching lines @@
   drag_drop_container->SetBoundsInScreenBehaviorForChildren(
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
 
   WmWindow* overlay_container =
       CreateContainer(kShellWindowId_OverlayContainer, "OverlayContainer",
                       lock_screen_related_containers);
   overlay_container->SetSnapsChildrenToPhysicalPixelBoundary();
   overlay_container->SetBoundsInScreenBehaviorForChildren(
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
 
-#if defined(OS_CHROMEOS)
   WmWindow* mouse_cursor_container = CreateContainer(
       kShellWindowId_MouseCursorContainer, "MouseCursorContainer", root_);
   mouse_cursor_container->SetBoundsInScreenBehaviorForChildren(
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
-#endif
 
   CreateContainer(kShellWindowId_PowerButtonAnimationContainer,
                   "PowerButtonAnimationContainer", root_);
 }
 
 void WmRootWindowController::CreateLayoutManagers() {
   GetShelf()->CreateShelfWidget(GetWindow());
 
   root_window_layout_manager_ = new wm::RootWindowLayoutManager(root_);
   root_->SetLayoutManager(base::WrapUnique(root_window_layout_manager_));
@@ skipping 112 matching lines @@
 }
 
 void WmRootWindowController::OnMenuClosed() {
   menu_runner_.reset();
   menu_model_adapter_.reset();
   menu_model_.reset();
   GetShelf()->UpdateVisibilityState();
 }
 
 }  // namespace ash