Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_adapter_android.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_ADAPTER_ANDROID_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/jni_android.h"
@@ skipping 110 matching lines @@
       BluetoothDiscoveryFilter* discovery_filter,
       const base::Closure& callback,
       const DiscoverySessionErrorCallback& error_callback) override;
   void SetDiscoveryFilter(
       std::unique_ptr<BluetoothDiscoveryFilter> discovery_filter,
       const base::Closure& callback,
       const DiscoverySessionErrorCallback& error_callback) override;
   void RemovePairingDelegateInternal(
       BluetoothDevice::PairingDelegate* pairing_delegate) override;
 
+  void PurgeTimedOutDevices();
+
+  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
+
   // Java object org.chromium.device.bluetooth.ChromeBluetoothAdapter.
   base::android::ScopedJavaGlobalRef<jobject> j_adapter_;
 
+ private:
+  size_t num_discovery_sessions_ = 0;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterAndroid);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_ANDROID_H_