Remove old-avatar supervised user labels on non-Mac.

chrome/browser/ui/views/profiles/supervised_user_avatar_label.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 CHROME_BROWSER_UI_VIEWS_PROFILES_SUPERVISED_USER_AVATAR_LABEL_H_
-#define CHROME_BROWSER_UI_VIEWS_PROFILES_SUPERVISED_USER_AVATAR_LABEL_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "chrome/browser/supervised_user/supervised_users.h"
-#include "ui/views/controls/button/label_button.h"
-
-class BrowserView;
-
-// SupervisedUserAvatarLabel
-//
-// A label used to display a string indicating that the current profile belongs
-// to a supervised user.
-class SupervisedUserAvatarLabel : public views::LabelButton {
- public:
-  explicit SupervisedUserAvatarLabel(BrowserView* browser_view);
-  ~SupervisedUserAvatarLabel() override;
-
-  // views::LabelButton:
-  bool OnMousePressed(const ui::MouseEvent& event) override;
-
-  // Update the style of the label according to the provided theme.
-  void UpdateLabelStyle();
-
-  // Sets whether the label should be displayed on the right or on the left. A
-  // new button border is created which has the right insets for the positioning
-  // of the button.
-  void SetLabelOnRight(bool label_on_right);
-
- private:
-  BrowserView* browser_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(SupervisedUserAvatarLabel);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_PROFILES_SUPERVISED_USER_AVATAR_LABEL_H_