New JS Conformance check: ban Closure-style top-level declarations from having implicitly public visibility.
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=79863422
Allow access to JSError node
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=79949919