Removes aura dependencies from WindowPositioner

ash/wm/aura/wm_root_window_controller_aura.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/wm/aura/wm_root_window_controller_aura.h"
 
 #include "ash/root_window_controller.h"
+#include "ash/wm/aura/wm_globals_aura.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_property.h"
 
 DECLARE_WINDOW_PROPERTY_TYPE(ash::wm::WmRootWindowControllerAura*);
 
 namespace ash {
 namespace wm {
 
 // TODO(sky): it likely makes more sense to hang this off RootWindowSettings.
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(ash::wm::WmRootWindowControllerAura,
@@ skipping 27 matching lines @@
     return wm_root_window_controller;
 
   // WmRootWindowControllerAura is owned by the RootWindowController's window.
   return new WmRootWindowControllerAura(root_window_controller);
 }
 
 bool WmRootWindowControllerAura::HasShelf() {
   return root_window_controller_->shelf() != nullptr;
 }
 
+WmGlobals* WmRootWindowControllerAura::GetGlobals() {
+  return WmGlobalsAura::Get();
+}
+
 }  // namespace wm
 }  // namespace ash