Daniel Holbert 801cf30e07 Bug 1662838 part 2: Remove nsIContentViewer's unused pausePainting() and resumePainting() APIs. r=tnikkel
These APIs are entirely unused (aside from one usage in a test, which part 1 in
this patch series removed), so this patch shouldn't impact behavior at all.

Historical note: we briefly removed these APIs once before, in this commit:
https://hg.mozilla.org/mozilla-central/rev/c216ff19d690
...but we brought them back because we had a motivating use case at the time.
We don't have any such motivating use cases any more, though.  So, this patch
here is essentially a modernized version of that older commit.

Differential Revision: https://phabricator.services.mozilla.com/D108148
2021-03-13 06:11:34 +00:00
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