Bug 1064550 - Remove xpcWrappedJSErrorReporter. r=bz

Given that the JS engine always clears exceptions immediately after reporting
them, the empty body after JSREPORT_IS_EXCEPTION causes us to eat exceptions
here.
Bug 1061136 - Followup bugfix. r=bz
Bug 1053725 - When one domain is whitelisted for file:// URI access, whitelist all subdomains. r=bz