Bug 829554 - Abstract ScopeIter/DebugScopeProxy frame access. r=luke

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extra : rebase_source : 18cc0baea68fb9b91b32c54bedcac6eb805449e3
Bug 829579 - Rewrite AllFramesIter to iterate Ion frames too. r=luke

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extra : rebase_source : 73b9cf6d2ab9b1a167cc6847fcc114045f796fc5