Bug 1180036 - Replace the warning that anonymous nodes should not be in child lists with an assert plus whitelisting of known-OK cases. r=bz

layout/base/RestyleManager.cpp

@@ -1470,7 +1470,8 @@ RestyleManager::RestyleForRemove(Element* aContainer,
     // This should be an assert, but this is called incorrectly in
     // nsHTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging
     // up the logs.  Make it an assert again when that's fixed.
-    NS_WARNING("anonymous nodes should not be in child lists (bug 439258)");
+    MOZ_ASSERT(aOldChild->GetProperty(nsGkAtoms::restylableAnonymousNode),
+               "anonymous nodes should not be in child lists (bug 439258)");
   }
   uint32_t selectorFlags =
     aContainer ? (aContainer->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;