Revert of Add a row in the network tray to inform users to turn Bluetooth on to enable Tether.

ash/system/tray/tray_info_label.h

-// Copyright 2017 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 ASH_SYSTEM_TRAY_TRAY_INFO_LABEL_H_
-#define ASH_SYSTEM_TRAY_TRAY_INFO_LABEL_H_
-
-#include "ash/system/tray/actionable_view.h"
-#include "ui/views/controls/label.h"
-
-namespace ash {
-
-// A view containing only a label, which is to be inserted as a
-// row within a system menu detailed view (e.g., the "Scanning for devices..."
-// message that can appear at the top of the Bluetooth detailed view).
-// TrayInfoLabel can be clickable; this property is configured by its delegate.
-class TrayInfoLabel : public ActionableView {
- public:
-  // A delegate for determining whether or not a TrayInfoLabel is clickable, and
-  // handling actions when it is clicked.
-  class Delegate {
-   public:
-    virtual ~Delegate() {}
-    virtual void OnLabelClicked(int message_id) = 0;
-    virtual bool IsLabelClickable(int message_id) const = 0;
-  };
-
-  // |delegate| may be null, which results in a TrayInfoLabel which cannot be
-  // clicked.
-  TrayInfoLabel(Delegate* delegate, int message_id);
-  ~TrayInfoLabel() override{};
-
-  // Updates the TrayInfoLabel to display the message associated with
-  // |message_id|. This may update text styling if the delegate indicates that
-  // the TrayInfoLabel should be clickable.
-  void Update(int message_id);
-
-  // ActionableView:
-  bool PerformAction(const ui::Event& event) override;
-  void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
-
- private:
-  friend class TrayInfoLabelTest;
-
-  bool IsClickable();
-
-  views::Label* const label_;
-  int message_id_;
-
-  Delegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayInfoLabel);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_TRAY_TRAY_INFO_LABEL_H_