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
The first step of Animation::Cancel(), it will release owning element. However we will use owning element for queueing the CSS-Animations event, So we will need to release owning element after calling Animation::Cancel() in order to fire the animationcancel event. MozReview-Commit-ID: ATqkIGkqREx --HG-- extra : rebase_source : 9b04dc59349d1203d5f8604516fcc6765cf3d5a7