Explicitly tell the preload request where to take the referrer from

third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 229 matching lines @@
     if (type == WTF::kNullopt)
       type = ResourceType();
 
     // The element's 'referrerpolicy' attribute (if present) takes precedence
     // over the document's referrer policy.
     ReferrerPolicy referrer_policy =
         (referrer_policy_ != kReferrerPolicyDefault) ? referrer_policy_
                                                      : document_referrer_policy;
     auto request = PreloadRequest::CreateIfNeeded(
         InitiatorFor(tag_impl_), position, url_to_load_, predicted_base_url,
-        type.value(), referrer_policy, resource_width, client_hints_preferences,
-        request_type);
+        type.value(), referrer_policy, PreloadRequest::kDocumentIsReferrer,
+        resource_width, client_hints_preferences, request_type);
     if (!request)
       return nullptr;
 
     request->SetCrossOrigin(cross_origin_);
     request->SetNonce(nonce_);
     request->SetCharset(Charset());
     request->SetDefer(defer_);
     request->SetIntegrityMetadata(integrity_metadata_);
 
     return request;
@@ skipping 671 matching lines @@
   default_viewport_min_width = document->ViewportDefaultMinWidth();
   viewport_meta_zero_values_quirk =
       document->GetSettings() &&
       document->GetSettings()->GetViewportMetaZeroValuesQuirk();
   viewport_meta_enabled = document->GetSettings() &&
                           document->GetSettings()->GetViewportMetaEnabled();
   referrer_policy = document->GetReferrerPolicy();
 }
 
 }  // namespace blink