Bug 626768 - Add a runtime-abort for recursive layout module initialization, because it is somewhat likely that bugs of this sort could cause the later runtime abort where the cycle collector cannot get the JS runtime service r=bent a=blocker

layout/build/nsLayoutModule.cpp

@@ -384,7 +384,7 @@ nsresult
 Initialize()
 {
   if (gInitialized) {
-    NS_ERROR("Recursive layout module initialization");
+    NS_RUNTIMEABORT("Recursive layout module initialization");
     return NS_ERROR_FAILURE;
   }