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

ash/wm/panels/panel_window_resizer.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_window_resizer.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf_types.h"
@@ skipping 59 matching lines @@
       screen->GetDisplayNearestPoint(last_location_);
   if (dst_display.id() !=
       screen->GetDisplayNearestWindow(panel_container_->GetRootWindow()).id()) {
     // The panel is being dragged to a new display. If the previous container is
     // the current parent of the panel it will be informed of the end of drag
     // when the panel is reparented, otherwise let the previous container know
     // the drag is complete. If we told the panel's parent that the drag was
     // complete it would begin positioning the panel.
     if (GetTarget()->parent() != panel_container_)
       GetPanelLayoutManager(panel_container_)->FinishDragging();
-    aura::RootWindow* dst_root = Shell::GetInstance()->display_controller()->
+    aura::Window* dst_root = Shell::GetInstance()->display_controller()->
         GetRootWindowForDisplayId(dst_display.id());
     panel_container_ = Shell::GetContainer(
         dst_root, internal::kShellWindowId_PanelContainer);
 
     // The panel's parent already knows that the drag is in progress for this
     // panel.
     if (panel_container_ && GetTarget()->parent() != panel_container_)
       GetPanelLayoutManager(panel_container_)->StartDragging(GetTarget());
   }
   gfx::Point offset;
@@ skipping 99 matching lines @@
   // attaching it so that it does not get repositioned.
   if (panel_container_)
     GetPanelLayoutManager(panel_container_)->StartDragging(GetTarget());
   if (!was_attached_) {
     // Attach the panel while dragging placing it in front of other panels.
     wm::GetWindowState(GetTarget())->set_continue_drag_after_reparent(true);
     wm::GetWindowState(GetTarget())->set_panel_attached(true);
     // We use root window coordinates to ensure that during the drag the panel
     // is reparented to a container in the root window that has that window.
     aura::Window* target = GetTarget();
-    aura::RootWindow* target_root = target->GetRootWindow();
+    aura::Window* target_root = target->GetRootWindow();
     aura::client::ParentWindowWithContext(
         target, target_root, target_root->GetBoundsInScreen());
     wm::ReparentTransientChildrenOfChild(target->parent(), target);
   }
 }
 
 void PanelWindowResizer::FinishDragging() {
   if (!did_move_or_resize_)
     return;
   if (wm::GetWindowState(GetTarget())->panel_attached() != should_attach_) {
     wm::GetWindowState(GetTarget())->set_panel_attached(should_attach_);
     // We use last known location to ensure that after the drag the panel
     // is reparented to a container in the root window that has that location.
     aura::Window* target = GetTarget();
-    aura::RootWindow* target_root = target->GetRootWindow();
+    aura::Window* target_root = target->GetRootWindow();
     aura::client::ParentWindowWithContext(
         target, target_root, gfx::Rect(last_location_, gfx::Size()));
     wm::ReparentTransientChildrenOfChild(target->parent(), GetTarget());
   }
 
   // If we started the drag in one root window and moved into another root
   // but then canceled the drag we may need to inform the original layout
   // manager that the drag is finished.
   if (initial_panel_container_ != panel_container_)
      GetPanelLayoutManager(initial_panel_container_)->FinishDragging();
   if (panel_container_)
     GetPanelLayoutManager(panel_container_)->FinishDragging();
 }
 
 void PanelWindowResizer::UpdateLauncherPosition() {
   if (panel_container_) {
     GetPanelLayoutManager(panel_container_)->launcher()->
         UpdateIconPositionForWindow(GetTarget());
   }
 }
 
 }  // namespace aura