Remove outdated devices from Android device chooser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 4466d67f13f9181d2adb21cd08994fe6d6f90546..156ada73d968d573e96702f4cb09b0ab66386055 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.h
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.h
@@ -80,9 +80,6 @@ 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;
@@ -130,9 +127,6 @@ 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_;