Split up ios/web:test_support.

ios/web/public/test/http_server/delayed_response_provider.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.
 
-#import "ios/web/public/test/response_providers/delayed_response_provider.h"
+#import "ios/web/public/test/http_server/delayed_response_provider.h"
 
 #import <Foundation/Foundation.h>
 
 #import "base/ios/weak_nsobject.h"
+#import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
-#import "base/mac/foundation_util.h"
 #import "ios/third_party/gcdwebserver/src/GCDWebServer/Responses/GCDWebServerDataResponse.h"
 
 // A proxy class that will forward all messages to the |_response|.
 // It will delay read operation  |_delay| seconds.
 @interface DelayedGCDWebServerResponse : NSProxy {
   base::scoped_nsobject<GCDWebServerResponse> _response;
   NSTimeInterval _delay;
 }
 
 + (instancetype)responseWithServerResponse:(GCDWebServerResponse*)response
@@ skipping 94 matching lines @@
 GCDWebServerResponse* DelayedResponseProvider::GetGCDWebServerResponse(
     const Request& request) {
   DelayedGCDWebServerResponse* response = [DelayedGCDWebServerResponse
       responseWithServerResponse:delayed_provider_->GetGCDWebServerResponse(
                                      request)
                            delay:delay_];
   return base::mac::ObjCCastStrict<GCDWebServerResponse>(response);
 }
 
 }  // namespace web