This patch uses nsLiteralCString instead of nsCString for avoiding increasing
the number of static constructors. Also, it removes the declaration of
kInternalError and kExternalError on Beta and Release since they won't be use
in these channels.
Differential Revision: https://phabricator.services.mozilla.com/D16981
--HG--
extra : moz-landing-system : lando
Tom Tung