Make GetRootWindow() return a Window instead of a RootWindow.

ash/wm/panels/panel_layout_manager.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/wm/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 
 #include "ash/launcher/launcher.h"
@@ skipping 432 matching lines @@
 void PanelLayoutManager::OnLauncherIconPositionsChanged() {
   // TODO: As this is called for every animation step now. Relayout needs to be
   // updated to use current icon position instead of use the ideal bounds so
   // that the panels slide with their icons instead of jumping.
   Relayout();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, ash::ShellObserver implementation:
 
-void PanelLayoutManager::OnShelfAlignmentChanged(
-    aura::RootWindow* root_window) {
+void PanelLayoutManager::OnShelfAlignmentChanged(aura::Window* root_window) {
   if (panel_container_->GetRootWindow() == root_window)
     Relayout();
 }
 
 /////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, WindowObserver implementation:
 
 void PanelLayoutManager::OnWindowShowTypeChanged(
     wm::WindowState* window_state,
     wm::WindowShowType old_type) {
@@ skipping 400 matching lines @@
 
 void PanelLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propogate automatically to this class, so manually recalculate bounds.
   OnWindowResized();
 }
 
 }  // namespace internal
 }  // namespace ash