Change ChooserController ownership model

chrome/browser/ui/bluetooth/chrome_extension_bluetooth_chooser.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.
 
 #include "chrome/browser/ui/bluetooth/chrome_extension_bluetooth_chooser.h"
 
 #include "chrome/browser/extensions/chrome_extension_chooser_dialog.h"
 #include "chrome/browser/ui/bluetooth/bluetooth_chooser_controller.h"
 #include "content/public/browser/web_contents.h"
 
 ChromeExtensionBluetoothChooser::ChromeExtensionBluetoothChooser(
     content::RenderFrameHost* frame,
     const content::BluetoothChooser::EventHandler& event_handler) {
-  bluetooth_chooser_controller_.reset(
+  std::unique_ptr<BluetoothChooserController> bluetooth_chooser_controller(
       new BluetoothChooserController(frame, event_handler));
+  // Since ChromeExtensionBluetoothChooser object is destroyed before the
+  // view object which owns |bluetooth_chooser_controller_| when the chooser
+  // bubble/dialog closes, it is safe to store and use the raw pointer here.
+  bluetooth_chooser_controller_ = bluetooth_chooser_controller.get();
   chooser_dialog_.reset(new ChromeExtensionChooserDialog(
       content::WebContents::FromRenderFrameHost(frame)));
-  chooser_dialog_->ShowDialog(bluetooth_chooser_controller_.get());
+  chooser_dialog_->ShowDialog(std::move(bluetooth_chooser_controller));
 }
 
 ChromeExtensionBluetoothChooser::~ChromeExtensionBluetoothChooser() {}
 
 void ChromeExtensionBluetoothChooser::SetAdapterPresence(
     AdapterPresence presence) {}
 
 void ChromeExtensionBluetoothChooser::ShowDiscoveryState(DiscoveryState state) {
 }
 
 void ChromeExtensionBluetoothChooser::AddDevice(
     const std::string& device_id,
     const base::string16& device_name) {
   bluetooth_chooser_controller_->AddDevice(device_id, device_name);
 }
 
 void ChromeExtensionBluetoothChooser::RemoveDevice(
     const std::string& device_id) {
   bluetooth_chooser_controller_->RemoveDevice(device_id);
 }