Revert of Fix flakiness of DesktopDragDropClientAuraX11Tests

ui/views/widget/desktop_aura/x11_move_loop.h

-// Copyright 2014 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.
-
-#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_
-#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_
-
-#include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/x/x11_types.h"
-
-namespace views {
-
-// Runs a nested message loop and grabs the mouse. This is used to implement
-// dragging.
-class X11MoveLoop {
- public:
-  virtual ~X11MoveLoop() {}
-
-  // Runs the nested message loop. While the mouse is grabbed, use |cursor| as
-  // the mouse cursor. Returns true if the move-loop is completed successfully.
-  // If the pointer-grab fails, or the move-loop is canceled by the user (e.g.
-  // by pressing escape), then returns false.
-  virtual bool RunMoveLoop(aura::Window* window, gfx::NativeCursor cursor) = 0;
-
-  // Updates the cursor while the move loop is running.
-  virtual void UpdateCursor(gfx::NativeCursor cursor) = 0;
-
-  // Ends the RunMoveLoop() that's currently in progress.
-  virtual void EndMoveLoop() = 0;
-
-  // Sets an image to be used during the drag.
-  virtual void SetDragImage(const gfx::ImageSkia& image,
-                            const gfx::Vector2dF& offset) = 0;
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_MOVE_LOOP_H_