Bug 1230425 - Fix the test of transform of Combines3DTransformWithAncestors. r=mattwoodrow

--HG--
extra : rebase_source : 150571617831a4d1c67e21a3a6cd0fd6db3b522f

layout/generic/nsFrame.cpp

@@ -1197,7 +1197,7 @@ nsIFrame::Combines3DTransformWithAncestors() const
   if (!GetParent() || !GetParent()->Extend3DContext()) {
     return false;
   }
-  return StyleDisplay()->HasTransform(this) || BackfaceIsHidden();
+  return IsTransformed() || BackfaceIsHidden();
 }
 
 bool