Remove prerender cookie store, part 4.

ios/net/crn_http_protocol_handler.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.
 
 #import "ios/net/crn_http_protocol_handler.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 661 matching lines @@
     return;
   }
 
   const URLRequestContext* context =
       tracker_ ? tracker_->GetRequestContext()
                : g_protocol_handler_delegate->GetDefaultURLRequestContext()
                      ->GetURLRequestContext();
   DCHECK(context);
 
   net_request_ =
-      context->CreateRequest(url, DEFAULT_PRIORITY, this, nullptr).release();
+      context->CreateRequest(url, DEFAULT_PRIORITY, this).release();
   net_request_->set_method(base::SysNSStringToUTF8([request_ HTTPMethod]));
 
   net_request_->set_first_party_for_cookies(
       GURLWithNSURL([request_ mainDocumentURL]));
 
 #if !defined(NDEBUG)
   DVLOG(2) << "From client:";
   LogNSURLRequest(request_);
 #endif  // !defined(NDEBUG)
 
@@ skipping 250 matching lines @@
 - (void)stopLoading {
   g_protocol_handler_delegate->GetDefaultURLRequestContext()
       ->GetNetworkTaskRunner()
       ->PostTask(FROM_HERE,
                  base::Bind(&net::HttpProtocolHandlerCore::Cancel, _core));
   [_protocolProxy invalidate];
   _protocolProxy.reset();
 }
 
 @end