Reset Bluetooth EventHandler when it is invalid

chrome/browser/ui/bluetooth/bluetooth_chooser_desktop.cc

 // 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.
 
 #include "chrome/browser/ui/bluetooth/bluetooth_chooser_desktop.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h"
 
 BluetoothChooserDesktop::BluetoothChooserDesktop(
     BluetoothChooserController* bluetooth_chooser_controller)
     : bluetooth_chooser_controller_(bluetooth_chooser_controller) {
   DCHECK(bluetooth_chooser_controller_);
 }
 
-BluetoothChooserDesktop::~BluetoothChooserDesktop() {}
+BluetoothChooserDesktop::~BluetoothChooserDesktop() {
+  // This satisfies the WebContentsDelegate::RunBluetoothChooser() requirement
+  // that the EventHandler can be destroyed any time after the BluetoothChooser
+  // instance.
+  bluetooth_chooser_controller_->ResetEventHandler();
+}
 
 void BluetoothChooserDesktop::SetAdapterPresence(AdapterPresence presence) {
   bluetooth_chooser_controller_->OnAdapterPresenceChanged(presence);
 }
 
 void BluetoothChooserDesktop::ShowDiscoveryState(DiscoveryState state) {
   bluetooth_chooser_controller_->OnDiscoveryStateChanged(state);
 }
 
 void BluetoothChooserDesktop::AddDevice(const std::string& device_id,
                                         const base::string16& device_name) {
   bluetooth_chooser_controller_->AddDevice(device_id, device_name);
 }
 
 void BluetoothChooserDesktop::RemoveDevice(const std::string& device_id) {
   bluetooth_chooser_controller_->RemoveDevice(device_id);
 }