Bug 831633 - Back out 1c7bdeefa8ee (bug 830315) for introducing hundreds of non-virtual dtor warnings. r=waldo
Backed out changeset eb2f0c1fffc2 (bug 820613) for xpcshell failures.

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extra : rebase_source : 7fff4cec5a4d7839cd3ede5cd0322631e11f9d38