Split up ios/web:test_support.

ios/web/public/test/http_server/error_page_response_provider.h

 // 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.
 
-#ifndef IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_ERROR_PAGE_RESPONSE_PROVIDER_H_
-#define IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_ERROR_PAGE_RESPONSE_PROVIDER_H_
+#ifndef IOS_WEB_PUBLIC_TEST_HTTP_SERVER_ERROR_PAGE_RESPONSE_PROVIDER_H_
+#define IOS_WEB_PUBLIC_TEST_HTTP_SERVER_ERROR_PAGE_RESPONSE_PROVIDER_H_
 
 #include <map>
 #include <string>
 
-#import "ios/web/public/test/response_providers/html_response_provider.h"
+#import "ios/web/public/test/http_server/html_response_provider.h"
 #include "url/gurl.h"
 
 // A HtmlResponseProvider that supports the following additional URLs:
 // - GetRedirectToDnsFailureUrl - the response is a redirect to
 //   |GetDnsFailureUrl|.
 // - GetDnsFailureUrl - triggers a DNS error.
 class ErrorPageResponseProvider : public HtmlResponseProvider {
  public:
   ErrorPageResponseProvider() : HtmlResponseProvider() {}
   explicit ErrorPageResponseProvider(
       const std::map<GURL, std::string>& responses)
       : HtmlResponseProvider(responses) {}
   // Returns a URL that causes a DNS failure.
   static GURL GetDnsFailureUrl();
   // Returns a URL that redirects to a bad URL.
   static GURL GetRedirectToDnsFailureUrl();
 
   // HtmlResponseProvider implementation.
   bool CanHandleRequest(const Request& request) override;
   void GetResponseHeadersAndBody(
       const Request& request,
       scoped_refptr<net::HttpResponseHeaders>* headers,
       std::string* response_body) override;
 };
 
-#endif  // IOS_WEB_PUBLIC_TEST_RESPONSE_PROVIDERS_ERROR_PAGE_RESPONSE_PROVIDER_H_
+#endif  // IOS_WEB_PUBLIC_TEST_HTTP_SERVER_ERROR_PAGE_RESPONSE_PROVIDER_H_