@nical @moz-gfx
Bug 1602458 - Prevent recycled hash maps from growing indefinitely. r=gw
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b461b9e 
Differential Revision: https://phabricator.services.mozilla.com/D56560

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/98758fb9121864772ba6103e1562fccc1f49aefb