Divide CookieStoreIOS into two different classes with different backends

ios/chrome/browser/net/cookie_util.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/chrome/browser/net/cookie_util.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 #include <sys/sysctl.h>
 
 #include "base/logging.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
-#include "ios/net/cookies/cookie_store_ios.h"
+#include "ios/net/cookies/cookie_store_ios_persistent.h"
 #include "ios/web/public/web_thread.h"
 #include "net/cookies/cookie_monster.h"
 #include "net/cookies/cookie_store.h"
 #include "net/extras/sqlite/sqlite_persistent_cookie_store.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
@@ skipping 62 matching lines @@
     return CreateCookieMonster(config);
 
   scoped_refptr<net::SQLitePersistentCookieStore> persistent_store = nullptr;
   if (config.session_cookie_mode ==
       CookieStoreConfig::RESTORED_SESSION_COOKIES) {
     DCHECK(!config.path.empty());
     persistent_store = CreatePersistentCookieStore(
         config.path, true /* restore_old_session_cookies */,
         config.crypto_delegate);
   }
-  return base::MakeUnique<net::CookieStoreIOS>(persistent_store.get());
+  return base::MakeUnique<net::CookieStoreIOSPersistent>(
+      persistent_store.get());
 }
 
 bool ShouldClearSessionCookies() {
   NSUserDefaults* standardDefaults = [NSUserDefaults standardUserDefaults];
   struct timeval boottime;
   int mib[2] = {CTL_KERN, KERN_BOOTTIME};
   size_t size = sizeof(boottime);
   time_t lastCookieDeletionDate =
       [standardDefaults integerForKey:kLastCookieDeletionDate];
   time_t now;
@@ skipping 14 matching lines @@
       browser_state->GetRequestContext();
   web::WebThread::PostTask(
       web::WebThread::IO, FROM_HERE, base::BindBlockArc(^{
         getter->GetURLRequestContext()
             ->cookie_store()
             ->DeleteSessionCookiesAsync(base::Bind(&DoNothing));
       }));
 }
 
 }  // namespace cookie_util