Explicitly tell the preload request where to take the referrer from

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

Index: third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
index 8f01d5b96f058749411210ca4998037d45804d55..2b5cb3be45ac72fc4ce85bba8b90a71a8f1d3077 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -247,8 +247,8 @@ class TokenPreloadScanner::StartTagScanner {
                                                      : 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;