Backed out changeset 505e8f8480d2 (bug 913597) for Android failure

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extra : rebase_source : d9ffe836559fb5a63d895d40b4f89324c2932216
Bug 861489:  Fix SkipAnimationRule to do the right thing in the presence of new cascading rules.  r=bzbarsky
Crashtest for bug 861489.
Bug 902591. Check for Azure in ContentClientIncremental. r=mattwoodrow

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extra : rebase_source : 134ddc6a2fd891179b7531cea4222188b518f19a