Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

ui/views/widget/desktop_aura/desktop_drop_target_win.cc

 // Copyright (c) 2011 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/desktop_drop_target_win.h"
 
 #include "base/win/win_util.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/client/drag_drop_delegate.h"
 #include "ui/aura/window.h"
@@ skipping 78 matching lines @@
 void DesktopDropTargetWin::Translate(
     IDataObject* data_object,
     DWORD key_state,
     POINT position,
     DWORD effect,
     scoped_ptr<OSExchangeData>* data,
     scoped_ptr<ui::DropTargetEvent>* event,
     DragDropDelegate** delegate) {
   gfx::Point location(position.x, position.y);
   gfx::Point root_location = location;
-  root_window_->GetDispatcher()->ConvertPointFromNativeScreen(&root_location);
+  root_window_->GetDispatcher()->host()->ConvertPointFromNativeScreen(
+      &root_location);
   aura::Window* target_window =
       root_window_->GetEventHandlerForPoint(root_location);
   bool target_window_changed = false;
   if (target_window != target_window_) {
     if (target_window_)
       NotifyDragLeave();
     target_window_ = target_window;
     if (target_window_)
       target_window_->AddObserver(this);
     target_window_changed = true;
@@ skipping 27 matching lines @@
     return;
   DragDropDelegate* delegate =
       aura::client::GetDragDropDelegate(target_window_);
   if (delegate)
     delegate->OnDragExited();
   target_window_->RemoveObserver(this);
   target_window_ = NULL;
 }
 
 }  // namespace views