Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_low_energy_device_mac.h

Index: device/bluetooth/bluetooth_low_energy_device_mac.h
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.h b/device/bluetooth/bluetooth_low_energy_device_mac.h
index 9b972ba59f23fc02fcf74277e72717b1d2f8c01a..39deba3e02e93d2a5e0429fe80ee7574d737bab2 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.h
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.h
@@ -83,9 +83,6 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
       const ConnectToServiceCallback& callback,
       const ConnectToServiceErrorCallback& error_callback) override;
 
-  // BluetoothDeviceMac override.
-  NSDate* GetLastUpdateTime() const override;
-
  protected:
   // BluetoothDevice override.
   std::string GetDeviceName() const override;
@@ -148,9 +145,6 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   // 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_;