Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_low_energy_device_mac.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 DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 
 #if defined(OS_IOS)
 #import <CoreBluetooth/CoreBluetooth.h>
 #else  // !defined(OS_IOS)
@@ skipping 62 matching lines @@
               const ErrorCallback& error_callback) override;
   void ConnectToService(
       const BluetoothUUID& uuid,
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
   void ConnectToServiceInsecurely(
       const device::BluetoothUUID& uuid,
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
 
-  // BluetoothDeviceMac override.
-  NSDate* GetLastUpdateTime() const override;
-
  protected:
   // BluetoothDevice override.
   std::string GetDeviceName() const override;
   void CreateGattConnectionImpl() override;
   void DisconnectGatt() override;
 
   // Updates information about the device.
   virtual void Update(NSDictionary* advertisement_data, int rssi);
 
   static std::string GetPeripheralIdentifier(CBPeripheral* peripheral);
@@ skipping 27 matching lines @@
   // Whether the device is connectable.
   bool connectable_;
 
   // The peripheral's identifier, as returned by [CBPeripheral identifier].
   std::string identifier_;
 
   // A local address for the device created by hashing the peripheral
   // identifier.
   std::string hash_address_;
 
-  // Stores the time of the most recent call to Update().
-  base::scoped_nsobject<NSDate> last_update_time_;
-
   // The services (identified by UUIDs) that this device provides.
   std::set<BluetoothUUID> advertised_uuids_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyDeviceMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_