Allow redirects for requests that require preflight.

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 196 matching lines @@
   // m_securityOrigin. In such a case, build a ResourceLoaderOptions with
   // up-to-date values from them and this variable, and use it.
   const ResourceLoaderOptions m_resourceLoaderOptions;
 
   bool m_forceDoNotAllowStoredCredentials;
   RefPtr<SecurityOrigin> m_securityOrigin;
 
   // True while the initial URL and all the URLs of the redirects this object
   // has followed, if any, are same-origin to getSecurityOrigin().
   bool m_sameOriginRequest;
-  // Set to true if the current request is cross-origin and not simple.
-  bool m_crossOriginNonSimpleRequest;
 
   // Set to true when the response data is given to a data consumer handle.
   bool m_isUsingDataConsumerHandle;
 
   const bool m_async;
 
   // Holds the original request context (used for sanity checks).
   WebURLRequest::RequestContext m_requestContext;
 
   // Holds the original request for fallback in case the Service Worker
@@ skipping 24 matching lines @@
   // used to populate the HTTP Referer header when following the redirect.
   bool m_didRedirect;
   Referrer m_referrerAfterRedirect;
 
   RawResourceClientStateChecker m_checker;
 };
 
 }  // namespace blink
 
 #endif  // DocumentThreadableLoader_h