From a34a1d0043943c3c62a776f0490af6c7a12530f0 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Wed, 6 Apr 2011 00:11:42 -0700
Subject: [PATCH] Bug 577976 - Part 6: Add cast to resolve ambiguity in case
 'using' isn't supported by compiler, r=bzbarsky

---
 layout/style/nsCSSStyleSheet.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/layout/style/nsCSSStyleSheet.cpp b/layout/style/nsCSSStyleSheet.cpp
index e7e73917f601..728fed38541a 100644
--- a/layout/style/nsCSSStyleSheet.cpp
+++ b/layout/style/nsCSSStyleSheet.cpp
@@ -1274,7 +1274,7 @@ nsCSSStyleSheet::FindOwningWindowID() const
   }
 
   if (windowID == 0 && mOwnerRule) {
-    nsCOMPtr<nsIStyleSheet> sheet = mOwnerRule->GetStyleSheet();
+    nsCOMPtr<nsIStyleSheet> sheet = static_cast<css::Rule*>(mOwnerRule)->GetStyleSheet();
     if (sheet) {
       nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheet);
       if (cssSheet) {