Here's a try push with that change and apz.allow_zooming turned to false, to ensure that this change won't break tests when uplifted to beta.
Bug 1657627 Comment 6 Edit History
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Here's a try push with that change and apz.allow_zooming turned to false, to ensure that this change won't break tests when uplifted to beta. https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=5cfd73c8c6a5667750792a0e236db1fa1e9e359b