Implement request's redirect mode and RequestRedirect for Fetch

Source/modules/fetch/FetchManager.cpp

Index: Source/modules/fetch/FetchManager.cpp
diff --git a/Source/modules/fetch/FetchManager.cpp b/Source/modules/fetch/FetchManager.cpp
index 29b2f61ea1404304127a1d3fe565bbd53ff39aa9..27644d211257aef6af01557fc1afb3bfecbd6463 100644
--- a/Source/modules/fetch/FetchManager.cpp
+++ b/Source/modules/fetch/FetchManager.cpp
@@ -285,6 +285,7 @@ void FetchManager::Loader::start()
                 || m_request->headerList()->containsNonSimpleHeader()))) {
         // "Set |request|'s response tainting to |CORS|."
         m_request->setResponseTainting(FetchRequestData::CORSTainting);
+        m_request->setRedirect(WebURLRequest::FetchRedirectModeError);
         // "The result of performing an HTTP fetch using |request| with the
         // |CORS flag| and |CORS preflight flag| set."
         performHTTPFetch(true, true);
@@ -361,6 +362,7 @@ void FetchManager::Loader::performHTTPFetch(bool corsFlag, bool corsPreflightFla
     // FIXME: Support body.
     ResourceRequest request(m_request->url());
     request.setRequestContext(m_request->context());
+    request.setFetchRedirectMode(m_request->redirect());
     request.setHTTPMethod(m_request->method());
     const Vector<OwnPtr<FetchHeaderList::Header>>& list = m_request->headerList()->list();
     for (size_t i = 0; i < list.size(); ++i) {