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

ios/web/public/test/http_server/delayed_response_provider.mm

Index: ios/web/public/test/http_server/delayed_response_provider.mm
diff --git a/ios/web/public/test/http_server/delayed_response_provider.mm b/ios/web/public/test/http_server/delayed_response_provider.mm
index bf7ba92e549cdc76475bf6b0b12a20164286934b..83f34baed8eb5ec25e22d0b4371730d8b6a9fedd 100644
--- a/ios/web/public/test/http_server/delayed_response_provider.mm
+++ b/ios/web/public/test/http_server/delayed_response_provider.mm
@@ -7,13 +7,15 @@
 #import <Foundation/Foundation.h>
 
 #include "base/bind.h"
-#import "base/ios/weak_nsobject.h"
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "net/test/embedded_test_server/http_response.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace web {
 
 // Delays |delay| seconds before sending a response to the client.