Tim Burke ce9e56a6d1 lint: Consistently use assertIsInstance
This has been available since py32 and was backported to py27; there
is no point in us continuing to carry the old idiom forward.

Change-Id: I21f64b8b2970e2dd5f56836f7f513e7895a5dc88
2024-02-07 15:48:39 -08:00
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