Explicitly tell the preload request where to take the referrer from

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

Index: third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
index 71157e1308d4d340319c32850d16b531d99659f5..edfffe96f7615d0a1acee5d51e9c51a96d7f2993 100644
--- a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
@@ -241,7 +241,7 @@ void CSSPreloadScanner::EmitRule(const SegmentedString& source) {
     auto request = PreloadRequest::CreateIfNeeded(
         FetchInitiatorTypeNames::css, position, url,
         *predicted_base_element_url_, Resource::kCSSStyleSheet,
-        referrer_policy_);
+        referrer_policy_, PreloadRequest::kBaseUrlIsReferrer);
     if (request) {
       // FIXME: Should this be including the charset in the preload request?
       requests_->push_back(std::move(request));