Remove setting an empty origin header in FrameFetchContext

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 65 matching lines @@
             request.setHTTPReferrer(Referrer(outgoingReferrer, document->referrerPolicy()));
 
         request.addHTTPOriginIfNeeded(AtomicString(outgoingOrigin));
     }
 
     // The remaining modifications are only necessary for HTTP and HTTPS.
     if (!request.url().isEmpty() && !request.url().protocolIsInHTTPFamily())
         return;
 
     m_frame->loader().applyUserAgent(request);
-
-    // Default to sending an empty Origin header if one hasn't been set yet.
-    request.addHTTPOriginIfNeeded(nullAtom);
 }
 
 void FrameFetchContext::setFirstPartyForCookies(ResourceRequest& request)
 {
     if (m_frame->tree().top()->isLocalFrame())
         request.setFirstPartyForCookies(toLocalFrame(m_frame->tree().top())->document()->firstPartyForCookies());
 }
 
 CachePolicy FrameFetchContext::cachePolicy(Document* document) const
 {
@@ skipping 98 matching lines @@
     if (!response.isNull())
         dispatchDidReceiveResponse(ensureLoader(loader), identifier, response);
 
     if (dataLength > 0)
         dispatchDidReceiveData(ensureLoader(loader), identifier, 0, dataLength, 0);
 
     dispatchDidFinishLoading(ensureLoader(loader), identifier, 0, 0);
 }
 
 } // namespace WebCore