Auto merge of #16268 - jdm:tmp, r=jdm

Basic MutationObserver interface stubs

Rebase and squash of https://github.com/servo/servo/pull/16190.

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bors-servo 2017-04-05 01:56:16 -05:00 committed by GitHub
commit 8e2a1477ae
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prefs: ["dom.mutation_observer.enabled:true"]