Remove window requirement from remote-config

[spookyuser]

Discussion

As per #2242 firebase remote config will throw an error in any environment without a window variable.

The only reason for requiring the window variable seems to be setting the window.FIREBASE_REMOTE_CONFIG_URL_BASE

With a very slight tweak, we can make remote config run in contexts like chrome extension service workers which don't have the window variable but do work fine with remote config in every other respect and moreover where remote config proves to be especially useful, given the time it takes to roll out extension updates.

[citation: am currently using it in service worker with this patch and it works great]

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[spookyuser]

Seems like this was fixed yesterday by #8699 thanks so much!