[ios] Removed CookieStoreIOS::UnSynchronize.

ios/net/cookies/cookie_store_ios.mm

 // Copyright 2012 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/net/cookies/cookie_store_ios.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include "base/bind.h"
@@ skipping 309 matching lines @@
   // Create a cookie store with no persistent store backing. Then, populate
   // it from the system's cookie jar.
   std::unique_ptr<CookieStoreIOS> cookie_store(
       new CookieStoreIOS(nullptr, cookie_storage));
   cookie_store->synchronization_state_ = SYNCHRONIZED;
   cookie_store->FlushStore(base::Closure());
   return cookie_store;
 }
 
 // static
-void CookieStoreIOS::SwitchSynchronizedStore(CookieStoreIOS* old_store,
-                                             CookieStoreIOS* new_store) {
-  DCHECK(new_store);
-  DCHECK_NE(new_store, old_store);
-  if (old_store)
-    old_store->SetSynchronizedWithSystemStore(false);
-  new_store->SetSynchronizedWithSystemStore(true);
-}
-
-// static
 void CookieStoreIOS::NotifySystemCookiesChanged() {
   NotificationTrampoline::GetInstance()->NotifyCookiesChanged();
 }
 
-void CookieStoreIOS::UnSynchronize() {
-  SetSynchronizedWithSystemStore(false);
-}
-
 void CookieStoreIOS::SetMetricsEnabled() {
   static CookieStoreIOS* g_cookie_store_with_metrics = nullptr;
   DCHECK(!g_cookie_store_with_metrics || g_cookie_store_with_metrics == this)
       << "Only one cookie store may use metrics.";
   g_cookie_store_with_metrics = this;
   metrics_enabled_ = true;
 }
 
 #pragma mark -
 #pragma mark CookieStore methods
@@ skipping 744 matching lines @@
                     weak_factory_.GetWeakPtr(), callback);
 }
 
 base::Closure CookieStoreIOS::WrapClosure(const base::Closure& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return base::Bind(&CookieStoreIOS::UpdateCachesAfterClosure,
                     weak_factory_.GetWeakPtr(), callback);
 }
 
 }  // namespace net