Bug 1152106, part 1 - Don't try to redefine the non-configurable global Components property when EnableUniversalXPConnect is called multiple times. r=bholley.

--HG--
extra : rebase_source : 6509b0adaaa6be10bfd9c696f2d4368946877990

js/xpconnect/src/XPCJSRuntime.cpp

@@ -521,6 +521,8 @@ EnableUniversalXPConnect(JSContext* cx)
     CompartmentPrivate* priv = CompartmentPrivate::Get(compartment);
     if (!priv)
         return true;
+    if (priv->universalXPConnectEnabled)
+        return true;
     priv->universalXPConnectEnabled = true;
 
     // Recompute all the cross-compartment wrappers leaving the newly-privileged