Restore KeyedServiceFactory diagnostics for context use-after-destroy.

chrome/browser/extensions/api/braille_display_private/braille_display_private_api.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/extensions/api/braille_display_private/braille_display_private_api.h"
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "build/build_config.h"
@@ skipping 33 matching lines @@
 BrailleDisplayPrivateAPI::BrailleDisplayPrivateAPI(
     content::BrowserContext* context)
     : profile_(Profile::FromBrowserContext(context)),
       scoped_observer_(this),
       event_delegate_(new DefaultEventDelegate(this, profile_)) {}
 
 BrailleDisplayPrivateAPI::~BrailleDisplayPrivateAPI() {
 }
 
 void BrailleDisplayPrivateAPI::Shutdown() {
+  event_delegate_.reset();
 }
 
 static base::LazyInstance<
     BrowserContextKeyedAPIFactory<BrailleDisplayPrivateAPI>>::DestructorAtExit
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<BrailleDisplayPrivateAPI>*
 BrailleDisplayPrivateAPI::GetFactoryInstance() {
   return g_factory.Pointer();
@@ skipping 114 matching lines @@
 void BrailleDisplayPrivateWriteDotsFunction::Work() {
   BrailleController::GetInstance()->WriteDots(params_->cells, params_->columns,
                                               params_->rows);
 }
 
 bool BrailleDisplayPrivateWriteDotsFunction::Respond() {
   return true;
 }
 }  // namespace api
 }  // namespace extensions