Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_low_energy_device_mac.mm

 // 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.
 
 #include "device/bluetooth/bluetooth_low_energy_device_mac.h"
 
 #import <CoreFoundation/CoreFoundation.h>
 #include <stddef.h>
 
 #include "base/mac/mac_util.h"
@@ skipping 28 matching lines @@
 }
 
 BluetoothLowEnergyDeviceMac::~BluetoothLowEnergyDeviceMac() {
   if (IsGattConnected()) {
     GetMacAdapter()->DisconnectGatt(this);
   }
 }
 
 void BluetoothLowEnergyDeviceMac::Update(NSDictionary* advertisement_data,
                                          int rssi) {
-  last_update_time_.reset([[NSDate date] retain]);
+  UpdateTimestamp();
   rssi_ = rssi;
   NSNumber* connectable =
       [advertisement_data objectForKey:CBAdvertisementDataIsConnectable];
   connectable_ = [connectable boolValue];
   ClearServiceData();
   NSDictionary* service_data =
       [advertisement_data objectForKey:CBAdvertisementDataServiceDataKey];
   for (CBUUID* uuid in service_data) {
     NSData* data = [service_data objectForKey:uuid];
     BluetoothUUID service_uuid =
@@ skipping 151 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void BluetoothLowEnergyDeviceMac::ConnectToServiceInsecurely(
     const device::BluetoothUUID& uuid,
     const ConnectToServiceCallback& callback,
     const ConnectToServiceErrorCallback& error_callback) {
   NOTIMPLEMENTED();
 }
 
-NSDate* BluetoothLowEnergyDeviceMac::GetLastUpdateTime() const {
-  return last_update_time_.get();
-}
-
 std::string BluetoothLowEnergyDeviceMac::GetDeviceName() const {
   return base::SysNSStringToUTF8([peripheral_ name]);
 }
 
 void BluetoothLowEnergyDeviceMac::CreateGattConnectionImpl() {
   if (!IsGattConnected()) {
     GetMacAdapter()->CreateGattConnection(this);
   }
 }
 
@@ skipping 127 matching lines @@
   GattServiceMap gatt_services_swapped;
   gatt_services_swapped.swap(gatt_services_);
   gatt_services_swapped.clear();
   if (create_gatt_connection_error_callbacks_.empty()) {
     // TODO(http://crbug.com/585897): Need to pass the error.
     DidDisconnectGatt();
   } else {
     DidFailToConnectGatt(error_code);
   }
 }