Cancel MIDI permission request infobar on MIDIAccess stop.

chrome/browser/media/chrome_midi_permission_context_factory.cc

Index: chrome/browser/media/chrome_midi_permission_context_factory.cc
diff --git a/chrome/browser/media/chrome_midi_permission_context_factory.cc b/chrome/browser/media/chrome_midi_permission_context_factory.cc
index 85b0c79392bd89b3a332c4cb8bdd3bb269e05f7b..d124abd7d65ce2aba05afac8700dd686d48c2891 100644
--- a/chrome/browser/media/chrome_midi_permission_context_factory.cc
+++ b/chrome/browser/media/chrome_midi_permission_context_factory.cc
@@ -9,11 +9,35 @@
 #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
@@ -36,7 +60,7 @@ ChromeMIDIPermissionContextFactory::
 BrowserContextKeyedService*
 ChromeMIDIPermissionContextFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
-  return new ChromeMIDIPermissionContext(static_cast<Profile*>(profile));
+  return new Service(static_cast<Profile*>(profile));
 }
 
 content::BrowserContext*