Tidy up XMLHttpRequest::endLoading().

third_party/WebKit/Source/modules/fetch/FetchManager.cpp

Index: third_party/WebKit/Source/modules/fetch/FetchManager.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
index 39e8daaac8f00a839a7de5edd9c2f199df3a7b22..335a0adc4e89cd1e868d84e1249cdebcd2e23ee9 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
+++ b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
@@ -556,7 +556,7 @@ void FetchManager::Loader::loadSucceeded() {
   m_finished = true;
 
   if (document() && document()->frame() && document()->frame()->page() &&
-      m_responseHttpStatusCode >= 200 && m_responseHttpStatusCode < 300) {
+      FetchUtils::isSuccessfulStatusCode(m_responseHttpStatusCode)) {
     document()->frame()->page()->chromeClient().ajaxSucceeded(
         document()->frame());
   }