Revert of Linux Aura Task Manager Frame Buttons Misaligned

ui/views/window/window_button_order_provider.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_WINDOW_WINDOW_BUTTON_ORDER_PROVIDER_H_
-#define UI_VIEWS_WINDOW_WINDOW_BUTTON_ORDER_PROVIDER_H_
-
-#include <vector>
-
-#include "base/macros.h"
-#include "ui/views/views_export.h"
-#include "ui/views/window/frame_buttons.h"
-
-namespace views {
-
-// Stores the ordering of window control buttons. Provides a default ordering
-// of |FRAME_BUTTON_MINIMZE|, |FRAME_BUTTON_MAXIMIZE|, |FRAME_BUTTON_CLOSE|,
-// where all controls are on the trailing end of a window.
-//
-// On Linux users can provide configuration files to control the ordering. This
-// configuration is checked and overrides the defaults.
-class VIEWS_EXPORT WindowButtonOrderProvider {
- public:
-  static WindowButtonOrderProvider* GetInstance();
-
-  std::vector<views::FrameButton> const GetLeadingButtons() const;
-  std::vector<views::FrameButton> const GetTrailingButtons() const;
-
- protected:
-  WindowButtonOrderProvider();
-  virtual ~WindowButtonOrderProvider();
-
-  void SetWindowButtonOrder(
-      const std::vector<views::FrameButton>& leading_buttons,
-      const std::vector<views::FrameButton>& trailing_buttons);
-
- private:
-  friend class CustomFrameViewTest;
-
-  static WindowButtonOrderProvider* instance_;
-
-  // Layout arrangement of the window caption buttons. On linux these will be
-  // set via a WindowButtonOrderObserver. On other platforms a default
-  // arrangement of a trailing minimize, maximize, close, will be set.
-  std::vector<views::FrameButton> leading_buttons_;
-  std::vector<views::FrameButton> trailing_buttons_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowButtonOrderProvider);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_WINDOW_WINDOW_BUTTON_ORDER_PROVIDER_H_