Add help link when Bluetooth adapter is off for WebBluetooth chooser

chrome/browser/ui/bluetooth/bluetooth_chooser_controller.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 CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_CONTROLLER_H_
 #define CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_CONTROLLER_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 19 matching lines @@
   // ChooserController:
   bool ShouldShowIconBeforeText() const override;
   base::string16 GetNoOptionsText() const override;
   base::string16 GetOkButtonLabel() const override;
   size_t NumOptions() const override;
   int GetSignalStrengthLevel(size_t index) const override;
   bool IsConnected(size_t index) const override;
   bool IsPaired(size_t index) const override;
   base::string16 GetOption(size_t index) const override;
   void RefreshOptions() override;
+  void OpenAdapterOffHelpUrl() const override;
   base::string16 GetStatus() const override;
   void Select(size_t index) override;
   void Cancel() override;
   void Close() override;
   void OpenHelpCenterUrl() const override;
 
   // Update the state of the Bluetooth adapter.
   void OnAdapterPresenceChanged(
       content::BluetoothChooser::AdapterPresence presence);
 
@@ skipping 28 matching lines @@
   // Clears |device_names_and_ids_| and |device_name_counts_|. Called when
   // Bluetooth adapter is turned on or off, or when re-scan happens.
   void ClearAllDevices();
 
   std::vector<BluetoothDeviceInfo> devices_;
   std::unordered_map<std::string, base::string16> device_id_to_name_map_;
   // Maps from device name to number of devices with that name.
   std::unordered_map<base::string16, int> device_name_counts_;
 
   content::BluetoothChooser::EventHandler event_handler_;
-  base::string16 no_devices_text_;
   base::string16 status_text_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothChooserController);
 };
 
 #endif  // CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_CONTROLLER_H_