[ObjC ARC] Converts ios/web/public/test/http_server:http_server to ARC.

ios/web/public/test/http_server/http_server.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.
 
 #import "ios/web/public/test/http_server/http_server.h"
 
 #import <Foundation/Foundation.h>
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 #import "net/base/mac/url_conversions.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "net/test/embedded_test_server/http_request.h"
 #include "net/test/embedded_test_server/http_response.h"
 
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Converts a net::test_server::HttpRequest (received from the
 // EmbeddedTestServer servlet) to a request object that the ResponseProvider
 // expects.
 web::ResponseProvider::Request
 ResponseProviderRequestFromEmbeddedTestServerRequest(
     const net::test_server::HttpRequest& request) {
   net::HttpRequestHeaders headers;
   for (auto it = request.headers.begin(); it != request.headers.end(); ++it) {
@@ skipping 179 matching lines @@
   providers_.clear();
 }
 
 void HttpServer::SetPort(NSUInteger port) {
   base::AutoLock autolock(port_lock_);
   port_ = port;
 }
 
 }  // namespace test
 }  // namespace web