[ios] Removed CookieStoreIOS::UnSynchronize.

ios/web/shell/shell_url_request_context_getter.mm

 // 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/web/shell/shell_url_request_context_getter.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/base_paths.h"
@@ skipping 68 matching lines @@
     DCHECK(cookie_path_found);
     cookie_path = cookie_path.Append("WebShell").Append("Cookies");
     scoped_refptr<net::CookieMonster::PersistentCookieStore> persistent_store =
         new net::SQLitePersistentCookieStore(
             cookie_path, network_task_runner_,
             web::WebThread::GetBlockingPool()->GetSequencedTaskRunner(
                 web::WebThread::GetBlockingPool()->GetSequenceToken()),
             true, nullptr);
     std::unique_ptr<net::CookieStoreIOS> cookie_store(
         new net::CookieStoreIOS(persistent_store.get()));
-    net::CookieStoreIOS::SwitchSynchronizedStore(nullptr, cookie_store.get());
     storage_->set_cookie_store(std::move(cookie_store));
 
     std::string user_agent = web::GetWebClient()->GetUserAgent(false);
     storage_->set_http_user_agent_settings(
         base::MakeUnique<net::StaticHttpUserAgentSettings>("en-us,en",
                                                            user_agent));
     storage_->set_proxy_service(
         net::ProxyService::CreateUsingSystemProxyResolver(
             std::move(proxy_config_service_), 0,
             url_request_context_->net_log()));
@@ skipping 69 matching lines @@
 
   return url_request_context_.get();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 ShellURLRequestContextGetter::GetNetworkTaskRunner() const {
   return network_task_runner_;
 }
 
 }  // namespace web