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

ui/views/widget/desktop_aura/x11_desktop_window_move_client.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 "ui/views/widget/desktop_aura/x11_desktop_window_move_client.h"
 
 #include <X11/Xlib.h>
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
@@ skipping 32 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostLinux, aura::client::WindowMoveClient implementation:
 
 aura::client::WindowMoveResult X11DesktopWindowMoveClient::RunMoveLoop(
     aura::Window* source,
     const gfx::Vector2d& drag_offset,
     aura::client::WindowMoveSource move_source) {
   window_offset_ = drag_offset;
-  root_window_ = source->GetRootWindow();
+  root_window_ = source->GetDispatcher();
 
   bool success = move_loop_.RunMoveLoop(source, root_window_->last_cursor());
   return success ? aura::client::MOVE_SUCCESSFUL : aura::client::MOVE_CANCELED;
 }
 
 void X11DesktopWindowMoveClient::EndMoveLoop() {
   move_loop_.EndMoveLoop();
 }
 
 }  // namespace views