Notify the BluetoothAdapter::Observer when a bluetooth peripheral disconnects

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..4d7dc17a32be5d7c1a8de193bb1a74e325659e72 100644
--- a/device/bluetooth/bluetooth_device.cc
+++ b/device/bluetooth/bluetooth_device.cc
@@ -335,6 +335,7 @@ void BluetoothDevice::DidConnectGatt() {
   }
   create_gatt_connection_success_callbacks_.clear();
   create_gatt_connection_error_callbacks_.clear();
+  GetAdapter()->NotifyDeviceChanged(this);
 }
 
 void BluetoothDevice::DidFailToConnectGatt(ConnectErrorCode error) {
@@ -358,6 +359,7 @@ void BluetoothDevice::DidDisconnectGatt() {
     connection->InvalidateConnectionReference();
   }
   gatt_connections_.clear();
+  GetAdapter()->NotifyDeviceChanged(this);
 }
 
 void BluetoothDevice::AddGattConnection(BluetoothGattConnection* connection) {