[iOS] Remove support for asynchronous pref creation.

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 180 matching lines @@
   created_local_state_ = true;
 
   base::FilePath local_state_path;
   CHECK(PathService::Get(ios::FILE_LOCAL_STATE, &local_state_path));
   scoped_refptr<PrefRegistrySimple> pref_registry(new PrefRegistrySimple);
 
   // Register local state preferences.
   RegisterLocalStatePrefs(pref_registry.get());
 
   local_state_ = ::CreateLocalState(
-      local_state_path, local_state_task_runner_.get(), pref_registry, false);
+      local_state_path, local_state_task_runner_.get(), pref_registry);
 
   const int max_per_proxy =
       local_state_->GetInteger(ios::prefs::kMaxConnectionsPerProxy);
   net::ClientSocketPoolManager::set_max_sockets_per_proxy_server(
       net::HttpNetworkSession::NORMAL_SOCKET_POOL,
       std::max(std::min(max_per_proxy, 99),
                net::ClientSocketPoolManager::max_sockets_per_group(
                    net::HttpNetworkSession::NORMAL_SOCKET_POOL)));
 
   // Register the shutdown state before anything changes it.
   if (local_state_->HasPrefPath(prefs::kLastSessionExitedCleanly)) {
     was_last_shutdown_clean_ =
         local_state_->GetBoolean(prefs::kLastSessionExitedCleanly);
   }
 }