From c8d10536804e8dfcb04fcef11d21e225f988bef2 Mon Sep 17 00:00:00 2001
From: Boris Zbarsky <bzbarsky@mit.edu>
Date: Wed, 22 May 2019 21:18:27 +0000
Subject: [PATCH] Bug 1552541.  Consider document.domain when deciding on inner
 window reuse.  r=bholley

Differential Revision: https://phabricator.services.mozilla.com/D31857

--HG--
extra : moz-landing-system : lando
---
 dom/base/nsGlobalWindowOuter.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/dom/base/nsGlobalWindowOuter.cpp b/dom/base/nsGlobalWindowOuter.cpp
index bd11d1344e65..45655689e2f8 100644
--- a/dom/base/nsGlobalWindowOuter.cpp
+++ b/dom/base/nsGlobalWindowOuter.cpp
@@ -1537,10 +1537,8 @@ bool nsGlobalWindowOuter::WouldReuseInnerWindow(Document* aNewDocument) {
     return true;
   }
 
-  bool equal;
-  if (NS_SUCCEEDED(mDoc->NodePrincipal()->Equals(aNewDocument->NodePrincipal(),
-                                                 &equal)) &&
-      equal) {
+  if (BasePrincipal::Cast(mDoc->NodePrincipal())
+          ->FastEqualsConsideringDomain(aNewDocument->NodePrincipal())) {
     // The origin is the same.
     return true;
   }