[ios] Added web::test::SetUpHttpServer which takes ResponseProvider.

ios/web/public/test/http_server_util.mm

 // Copyright 2016 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/web/public/test/http_server_util.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #import "ios/web/public/test/http_server.h"
 #include "ios/web/public/test/response_providers/file_based_response_provider.h"
 #include "ios/web/public/test/response_providers/html_response_provider.h"
 
 namespace web {
 namespace test {
 
 void SetUpSimpleHttpServer(const std::map<GURL, std::string>& responses) {
+  SetUpHttpServer(base::MakeUnique<HtmlResponseProvider>(responses));
+}
+
+void SetUpFileBasedHttpServer() {
+  base::FilePath path;
+  PathService::Get(base::DIR_MODULE, &path);
+  SetUpHttpServer(base::MakeUnique<FileBasedResponseProvider>(path));
+}
+
+void SetUpHttpServer(std::unique_ptr<web::ResponseProvider> provider) {
   web::test::HttpServer& server = web::test::HttpServer::GetSharedInstance();
   DCHECK(server.IsRunning());
-  auto provider = base::MakeUnique<HtmlResponseProvider>(responses);
 
   server.RemoveAllResponseProviders();
   server.AddResponseProvider(std::move(provider));
-}
-
-void SetUpFileBasedHttpServer() {
-  web::test::HttpServer& server = web::test::HttpServer::GetSharedInstance();
-  DCHECK(server.IsRunning());
-  base::FilePath path;
-  PathService::Get(base::DIR_MODULE, &path);
-  auto provider = base::MakeUnique<FileBasedResponseProvider>(path);
-
-  server.RemoveAllResponseProviders();
-  server.AddResponseProvider(std::move(provider));
 }
 
 }  // namespace test
 }  // namespace web