Make generateReferrerHeader() return a Referrer instead of a String

Source/core/page/CreateWindow.cpp

Index: Source/core/page/CreateWindow.cpp
diff --git a/Source/core/page/CreateWindow.cpp b/Source/core/page/CreateWindow.cpp
index 3deb137e73a69da924fe6f1a010513129f0d070b..b14c81ee831f7bcd78d03403fc16deb6fce7652c 100644
--- a/Source/core/page/CreateWindow.cpp
+++ b/Source/core/page/CreateWindow.cpp
@@ -135,8 +135,7 @@ LocalFrame* createWindow(const String& urlString, const AtomicString& frameName,
     // that it eventually enters FrameLoader as an embedder-initiated navigation. FrameLoader
     // assumes no responsibility  for generating an embedder-initiated navigation's referrer,
     // so we need to ensure the proper referrer is set now.
-    Referrer referrer(SecurityPolicy::generateReferrerHeader(activeFrame->document()->referrerPolicy(), completedURL, activeFrame->document()->outgoingReferrer()), activeFrame->document()->referrerPolicy());
-    frameRequest.resourceRequest().setHTTPReferrer(referrer);
+    frameRequest.resourceRequest().setHTTPReferrer(SecurityPolicy::generateReferrerHeader(activeFrame->document()->referrerPolicy(), completedURL, activeFrame->document()->outgoingReferrer()));
 
     // We pass the opener frame for the lookupFrame in case the active frame is different from
     // the opener frame, and the name references a frame relative to the opener frame.