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

ash/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 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/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/ash_switches.h"
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 496 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // DockLayoutManager, ash::ShellObserver implementation:
 
 void DockedWindowLayoutManager::OnDisplayWorkAreaInsetsChanged() {
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::DISPLAY_INSETS_CHANGED);
   MaybeMinimizeChildrenExcept(dragged_window_);
 }
 
 void DockedWindowLayoutManager::OnFullscreenStateChanged(
-    bool is_fullscreen, aura::RootWindow* root_window) {
+    bool is_fullscreen, aura::Window* root_window) {
   if (dock_container_->GetRootWindow() != root_window)
     return;
   // Entering fullscreen mode (including immersive) hides docked windows.
   in_fullscreen_ = workspace_controller_->GetWindowState() ==
       WORKSPACE_WINDOW_STATE_FULL_SCREEN;
   {
     // prevent Relayout from getting called multiple times during this
     base::AutoReset<bool> auto_reset_in_layout(&in_layout_, true);
     // Use a copy of children array because a call to MinimizeDockedWindow or
     // RestoreDockedWindow can change order.
@@ skipping 11 matching lines @@
         if (!window_state->IsMinimized())
           RestoreDockedWindow(window_state);
       }
     }
   }
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
 
 void DockedWindowLayoutManager::OnShelfAlignmentChanged(
-    aura::RootWindow* root_window) {
+    aura::Window* root_window) {
   if (dock_container_->GetRootWindow() != root_window)
     return;
 
   if (!launcher_ || !launcher_->shelf_widget())
     return;
 
   if (alignment_ == DOCKED_ALIGNMENT_NONE)
     return;
 
   // Do not allow launcher and dock on the same side. Switch side that
@@ skipping 466 matching lines @@
 void DockedWindowLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 }  // namespace internal
 }  // namespace ash