Split up ios/web:test_support.

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"
-#import "ios/web/public/test/response_providers/file_based_response_provider.h"
-#import "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 SetUpSimpleHttpServerWithSetCookies(
-    const std::map<GURL, std::pair<std::string, 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());
-
-  server.RemoveAllResponseProviders();
-  server.AddResponseProvider(std::move(provider));
-}
-
-void AddResponseProvider(std::unique_ptr<web::ResponseProvider> provider) {
-  web::test::HttpServer& server = web::test::HttpServer::GetSharedInstance();
-  DCHECK(server.IsRunning());
-  server.AddResponseProvider(std::move(provider));
-}
-
-}  // namespace test
-}  // namespace web