bluetooth: Clean up WebBluetoothServiceImpl when adapter is removed

content/browser/bluetooth/bluetooth_dispatcher_host.cc

 // Copyright 2014 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_to_device_, characteristic_to_service_,
 // 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 465 matching lines @@
     for (device::BluetoothAdapter::Observer* observer : adapter_observers_) {
       adapter_->RemoveObserver(observer);
     }
   }
   adapter_ = adapter;
   if (adapter_.get()) {
     adapter_->AddObserver(this);
     for (device::BluetoothAdapter::Observer* observer : adapter_observers_) {
       adapter_->AddObserver(observer);
     }
+  } else {
+    // Notify that the adapter has been removed and observers should clean up
+    // their state.
+    for (device::BluetoothAdapter::Observer* observer : adapter_observers_) {
+      observer->AdapterPresentChanged(nullptr, false);
+    }
   }
 }
 
 void BluetoothDispatcherHost::StartDeviceDiscovery(
     RequestDeviceSession* session,
     int chooser_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (session->discovery_session) {
     // Already running; just increase the timeout.
     discovery_session_timer_.Reset();
@@ skipping 916 matching lines @@
     const PrimaryServicesRequest& request) {
   pending_primary_services_requests_[device_address].push_back(request);
 }
 
 url::Origin BluetoothDispatcherHost::GetOrigin(int frame_routing_id) {
   return RenderFrameHostImpl::FromID(render_process_id_, frame_routing_id)
       ->GetLastCommittedOrigin();
 }
 
 }  // namespace content