Revert of mandoline: Add back/forward support and UI.

mandoline/ui/desktop_ui/toolbar_view.h

-// Copyright 2015 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 MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_
-#define MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_
-
-#include "ui/views/view.h"
-#include "ui/views/controls/button/label_button.h"
-
-namespace views {
-class BoxLayout;
-class LabelButton;
-}
-
-namespace mandoline {
-class BrowserWindow;
-
-class ToolbarView : public views::View,
-                    public views::ButtonListener {
- public:
-  ToolbarView(BrowserWindow* browser_window);
-  ~ToolbarView() override;
-
-  // Sets the state of the visual elements.
-  void SetOmniboxText(const base::string16& text);
-  void SetBackForwardEnabled(bool back_enabled, bool forward_enabled);
-
-  // Overridden from views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
- private:
-  BrowserWindow* browser_window_;
-
-  views::BoxLayout* layout_;
-  views::LabelButton* back_button_;
-  views::LabelButton* forward_button_;
-  views::LabelButton* omnibox_launcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(ToolbarView);
-};
-
-}  // namespace mandoline
-
-#endif  // MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_