Revert of Fix flakiness of DesktopDragDropClientAuraX11Tests

ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h

+// Copyright (c) 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.
+
+#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_DELEGATE_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_DELEGATE_H_
+
+#include <X11/Xlib.h>
+// Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
+#undef RootWindow
+
+namespace views {
+
+// Receives mouse events while the X11WholeScreenMoveLoop is tracking a drag on
+// the screen.
+class X11WholeScreenMoveLoopDelegate {
+ public:
+  // Called when we receive a motion event.
+  virtual void OnMouseMovement(XMotionEvent* event) = 0;
+
+  // Called when the mouse button is released.
+  virtual void OnMouseReleased() = 0;
+
+  // Called when the user has released the mouse button. The move loop will
+  // release the grab after this has been called.
+  virtual void OnMoveLoopEnded() = 0;
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_DELEGATE_H_