Moves DragDropClient to aura/client

ui/views/mus/drop_target_mus.cc

 // Copyright 2016 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/mus/drop_target_mus.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "services/ui/public/interfaces/window_tree_constants.mojom.h"
+#include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/drop_target_event.h"
 #include "ui/views/mus/os_exchange_data_provider_mus.h"
-#include "ui/wm/public/drag_drop_client.h"
 #include "ui/wm/public/drag_drop_delegate.h"
 
 namespace views {
 
 static_assert(ui::DragDropTypes::DRAG_NONE == ui::mojom::kDropEffectNone,
               "Drag constants must be the same");
 static_assert(ui::DragDropTypes::DRAG_MOVE == ui::mojom::kDropEffectMove,
               "Drag constants must be the same");
 static_assert(ui::DragDropTypes::DRAG_COPY == ui::mojom::kDropEffectCopy,
               "Drag constants must be the same");
@@ skipping 108 matching lines @@
 void DropTargetMus::OnDragDropDone() {
   os_exchange_data_.reset();
 }
 
 void DropTargetMus::OnWindowDestroyed(aura::Window* window) {
   DCHECK_EQ(window, target_window_);
   target_window_ = nullptr;
 }
 
 }  // namespace views