Remove outdated devices from Android device chooser

device/bluetooth/bluetooth_device.cc

Index: device/bluetooth/bluetooth_device.cc
diff --git a/device/bluetooth/bluetooth_device.cc b/device/bluetooth/bluetooth_device.cc
index 7d37591f5ea21483e15af7ab315436d3e8a6e70e..8b9909960961c5b1afe942e01e1684cd26c87cdc 100644
--- a/device/bluetooth/bluetooth_device.cc
+++ b/device/bluetooth/bluetooth_device.cc
@@ -11,6 +11,7 @@
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/time/time.h"
 #include "base/values.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_gatt_connection.h"
@@ -23,7 +24,8 @@ namespace device {
 BluetoothDevice::BluetoothDevice(BluetoothAdapter* adapter)
     : adapter_(adapter),
       gatt_services_discovery_complete_(false),
-      services_data_(new base::DictionaryValue()) {}
+      services_data_(new base::DictionaryValue()),
+      last_update_time_(base::Time()) {}
 
 BluetoothDevice::~BluetoothDevice() {
   DidDisconnectGatt();
@@ -387,4 +389,8 @@ void BluetoothDevice::Pair(PairingDelegate* pairing_delegate,
   NOTREACHED();
 }
 
+void BluetoothDevice::UpdateTimestamp() {
+  last_update_time_ = base::Time::NowFromSystemTime();
+}
+
 }  // namespace device