This silences two warnings that I see in debug builds.
The first is from nsCacheProfilePrefObserver::ReadPrefs, where the
nsresult from the NS_APP_CACHE_PARENT_DIR directory getting will be
returned even if we successfully get the profile directory. (While
we're here, factor out some common functionality in this function.)
The second is from dealing with the result of
nsCacheService::CreateCustomOfflineDevice. Failing to create an offline
device is a normal condition, if the cache size is set to 0 or we have
explicitly disabled the offline cache. So don't warn in those cases.
Differential Revision: https://phabricator.services.mozilla.com/D70793
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extra : moz-landing-system : lando
1b811cea21