Cancel MIDI permission request infobar on MIDIAccess stop.

chrome/browser/media/chrome_midi_permission_context_factory.cc

 // Copyright 2013 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/media/chrome_midi_permission_context_factory.h"
 
 #include "chrome/browser/media/chrome_midi_permission_context.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 
+namespace {
+
+class Service : public BrowserContextKeyedService {
+ public:
+  explicit Service(Profile* profile) {
+    context_ = new ChromeMIDIPermissionContext(profile);
+  }
+
+  ChromeMIDIPermissionContext* context() {
+    return context_.get();
+  }
+
+  virtual void Shutdown() OVERRIDE {
+    context()->ShutdownOnUIThread();
+  }
+
+ private:
+  scoped_refptr<ChromeMIDIPermissionContext> context_;
+
+  DISALLOW_COPY_AND_ASSIGN(Service);
+};
+
+}  // namespace
+
 // static
 ChromeMIDIPermissionContext*
 ChromeMIDIPermissionContextFactory::GetForProfile(Profile* profile) {
-  return static_cast<ChromeMIDIPermissionContext*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true));
+  return static_cast<Service*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true))->context();
 }
 
 // static
 ChromeMIDIPermissionContextFactory*
 ChromeMIDIPermissionContextFactory::GetInstance() {
   return Singleton<ChromeMIDIPermissionContextFactory>::get();
 }
 
 ChromeMIDIPermissionContextFactory::
 ChromeMIDIPermissionContextFactory()
     : BrowserContextKeyedServiceFactory(
           "ChromeMIDIPermissionContext",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 ChromeMIDIPermissionContextFactory::
 ~ChromeMIDIPermissionContextFactory() {
 }
 
 BrowserContextKeyedService*
 ChromeMIDIPermissionContextFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
-  return new ChromeMIDIPermissionContext(static_cast<Profile*>(profile));
+  return new Service(static_cast<Profile*>(profile));
 }
 
 content::BrowserContext*
 ChromeMIDIPermissionContextFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }