Implement the gattserverdisconnected event.

content/browser/bluetooth/web_bluetooth_service_impl.cc

 // Copyright 2016 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.
 
 // ID Not In Map Note:
 // A service, characteristic, or descriptor ID not in the corresponding
 // BluetoothDispatcherHost map [service_id_to_device_address_,
 // characteristic_id_to_service_id_, descriptor_to_characteristic_] implies a
 // hostile renderer because a renderer obtains the corresponding ID from this
 // class and it will be added to the map at that time.
@@ skipping 191 matching lines @@
 }
 
 void WebBluetoothServiceImpl::DeviceChanged(device::BluetoothAdapter* adapter,
                                             device::BluetoothDevice* device) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!device->IsGattConnected() || !device->IsConnected()) {
     std::string device_id =
         connected_devices_->CloseConnectionToDeviceWithAddress(
             device->GetAddress());
     if (!device_id.empty()) {
-      // TODO(ortuno): Send event to client.
-      // http://crbug.com/581855
+      if (client_) {
+        client_->GattServerDisconnected(device_id);
+      }
     }
   }
 }
 
 void WebBluetoothServiceImpl::GattServicesDiscovered(
     device::BluetoothAdapter* adapter,
     device::BluetoothDevice* device) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   const std::string& device_address = device->GetAddress();
   VLOG(1) << "Services discovered for device: " << device_address;
@@ skipping 604 matching lines @@
 void WebBluetoothServiceImpl::ClearState() {
   characteristic_id_to_notify_session_.clear();
   pending_primary_services_requests_.clear();
   characteristic_id_to_service_id_.clear();
   service_id_to_device_address_.clear();
   connected_devices_.reset(
       new FrameConnectedBluetoothDevices(render_frame_host_));
 }
 
 }  // namespace content