Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_adapter.h

Index: device/bluetooth/bluetooth_adapter.h
diff --git a/device/bluetooth/bluetooth_adapter.h b/device/bluetooth/bluetooth_adapter.h
index 87f18ef2c3ef6542594f4ced9808d836dca86267..5e2e82607c76e97413c5e63bc38426990a807f9d 100644
--- a/device/bluetooth/bluetooth_adapter.h
+++ b/device/bluetooth/bluetooth_adapter.h
@@ -467,6 +467,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
       BluetoothRemoteGattDescriptor* descriptor,
       const std::vector<uint8_t>& value);
 
+  // The timeout in seconds used by RemoveTimedOutDevices.
+  static const base::TimeDelta timeoutSec;
+
  protected:
   friend class base::RefCounted<BluetoothAdapter>;
   friend class BluetoothDiscoverySession;
@@ -562,6 +565,12 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
 
   void DeleteDeviceForTesting(const std::string& address);
 
+  // Removes from |devices_| any previously paired, connected or seen
+  // devices which are no longer present. Notifies observers. Note:
+  // this is only used by platforms where there is no notification of
+  // lost devices.
+  void RemoveTimedOutDevices();
+
   // Observers of BluetoothAdapter, notified from implementation subclasses.
   base::ObserverList<device::BluetoothAdapter::Observer> observers_;