Add "registerable domain" support to OriginAccessEntry.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 561e47cdb06709176e45f63e0daa8522746fbefa..a9c37fc3fdf0091bc437c81ad03d425e11523a14 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -3981,7 +3981,7 @@ const KURL& Document::firstPartyForCookies() const
     // We're intentionally using the URL of each document rather than the document's SecurityOrigin.
     // Sandboxing a document into a unique origin shouldn't effect first-/third-party status for
     // cookies and site data.
-    OriginAccessEntry accessEntry(topDocument().url().protocol(), topDocument().url().host(), OriginAccessEntry::AllowSubdomains);
+    OriginAccessEntry accessEntry(topDocument().url().protocol(), topDocument().url().host(), OriginAccessEntry::AllowRegisterableDomains);
     const Document* currentDocument = this;
     while (currentDocument) {
         // Skip over srcdoc documents, as they are always same-origin with their closest non-srcdoc parent.