Bug 984495 - Add Window.onwheel to WebIDL. r=bz.

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extra : rebase_source : 3ab4bcb83696de8dffda3d216043438c6d1e3332
Bug 988363 - Outerize when wrapping nsGlobalWindow. r=bz.

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extra : rebase_source : 68b2816295a8f37fa544d8c79317794e945f2f7e
Bug 988334 - Stop reusing SpecialPowers for different windows. r=jmaher.

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extra : rebase_source : ffeb4f2d49c6a20a95cc3ca0da63b49c10dee904