[ObjC ARC] Converts ios/net to ARC.

ios/net/http_protocol_logging.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/http_protocol_logging.h"
 
 #include <Foundation/Foundation.h>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/net/url_scheme_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const unsigned int kMaxUrlLength = 100;
 }
 
 namespace net {
 
 void LogNSURLRequest(NSURLRequest* request) {
   DVLOG_IF(2, UrlHasDataScheme([request URL]) &&
               [[[request URL] absoluteString] length] > kMaxUrlLength)
       << "Request (data scheme) "
@@ skipping 45 matching lines @@
 
   DVLOG_IF(2, [response isKindOfClass:[NSHTTPURLResponse class]])
       << "Response code: " << [(NSHTTPURLResponse*)response statusCode];
 
   DVLOG_IF(2, [response textEncodingName])
       << "Text encoding: "
       << base::SysNSStringToUTF8([response textEncodingName]);
 }
 
 }  // namespace http_protocol_logging