Fix wrap-o in assertion message. Debug only.

content/base/src/nsGenericDOMDataNode.cpp

@@ -611,7 +611,7 @@ nsGenericDOMDataNode::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
     NS_ASSERTION(IsRootOfNativeAnonymousSubtree() ||
                  !HasFlag(NODE_IS_IN_ANONYMOUS_SUBTREE) ||
                  aBindingParent->IsInNativeAnonymousSubtree(),
-                 "Trying to re-bind content from native anonymous subtree to"
+                 "Trying to re-bind content from native anonymous subtree to "
                  "non-native anonymous parent!");
     slots->mBindingParent = aBindingParent; // Weak, so no addref happens.
     if (IsRootOfNativeAnonymousSubtree() ||