Remove now obsolete Shutdown method of ChromeBrowserStateManager.

ios/chrome/browser/application_context_impl.cc

 // Copyright 2014 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 "ios/chrome/browser/application_context_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 115 matching lines @@
   // SafeBrowsing before the IO thread gets destroyed, since their destructors
   // can call the URLFetcher destructor, which does a PostDelayedTask operation
   // on the IO thread. (The IO thread will handle that URLFetcher operation
   // before going away.)
   if (safe_browsing_service_)
     safe_browsing_service_->ShutDown();
 
   metrics_services_manager_.reset();
 
   // Need to clear browser states before the IO thread.
-  if (chrome_browser_state_manager_) {
-    // TODO(crbug.com/560854): the ShutDown() method can be folded into the
-    // destructor once ApplicationContextImpl owns ChromeBrowserStateManager.
-    chrome_browser_state_manager_->ShutDown();
-    chrome_browser_state_manager_.reset();
-  }
+  chrome_browser_state_manager_.reset();
 
   // PromoResourceService must be destroyed after the keyed services and before
   // the IO thread.
   promo_resource_service_.reset();
 
   // The GCMDriver must shut down while the IO thread is still alive.
   if (gcm_driver_)
     gcm_driver_->Shutdown();
 
   if (local_state_) {
@@ skipping 238 matching lines @@
           worker_pool->GetSequenceToken(),
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
 
   gcm_driver_ = gcm::CreateGCMDriverDesktop(
       make_scoped_ptr(new gcm::GCMClientFactory), GetLocalState(), store_path,
       GetSystemURLRequestContext(), ::GetChannel(),
       web::WebThread::GetTaskRunnerForThread(web::WebThread::UI),
       web::WebThread::GetTaskRunnerForThread(web::WebThread::IO),
       blocking_task_runner);
 }