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

chrome/browser/download/drag_download_item_views.cc

 // Copyright 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 "chrome/browser/download/drag_download_item.h"
 
 #include <string>
 
 #include "content/public/browser/download_item.h"
 #include "net/base/mime_util.h"
@@ skipping 40 matching lines @@
     net::GetMimeTypeFromFile(full_path, &mime_type);
 
   // Add URL so that we can load supported files when dragged to WebContents.
   if (net::IsSupportedMimeType(mime_type)) {
     data.SetURL(net::FilePathToFileURL(full_path),
                 download->GetFileNameToReportUser().LossyDisplayName());
   }
 
 #if !defined(TOOLKIT_GTK)
 #if defined(USE_AURA)
-  aura::RootWindow* root_window = view->GetRootWindow();
+  aura::Window* root_window = view->GetRootWindow();
   if (!root_window || !aura::client::GetDragDropClient(root_window))
     return;
 
   gfx::Point location = gfx::Screen::GetScreenFor(view)->GetCursorScreenPoint();
   // TODO(varunjain): Properly determine and send DRAG_EVENT_SOURCE below.
   aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
       data,
       root_window,
       view,
       location,
@@ skipping 18 matching lines @@
 
   views::NativeWidgetGtk* widget = static_cast<views::NativeWidgetGtk*>(
       views::Widget::GetWidgetForNativeView(root)->native_widget());
   if (!widget)
     return;
 
   widget->DoDrag(data,
                  ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK);
 #endif  // TOOLKIT_GTK
 }