Tidy up XMLHttpRequest::endLoading().

third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp

Index: third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp
diff --git a/third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp b/third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp
index 49b16403813c70ecd395e4cd0f9e708df6755c4d..5385c8d885640dbbad7760972069eb3450f7cb09 100644
--- a/third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp
+++ b/third_party/WebKit/Source/core/fetch/CrossOriginAccessControl.cpp
@@ -281,9 +281,10 @@ bool passesPreflightStatusCheck(const ResourceResponse& response,
   // Fetch API Spec: https://fetch.spec.whatwg.org/#cors-preflight-fetch
   // CORS Spec: http://www.w3.org/TR/cors/#cross-origin-request-with-preflight-0
   // https://crbug.com/452394
-  if (response.httpStatusCode() < 200 || response.httpStatusCode() >= 300) {
+  int statusCode = response.httpStatusCode();
+  if (!FetchUtils::isOkStatus(statusCode)) {
     errorDescription = "Response for preflight has invalid HTTP status code " +
-                       String::number(response.httpStatusCode());
+                       String::number(statusCode);
     return false;
   }