Bug 1033952 - Implement "IsRemovable" and "IsHotSwappable" API for device storage. r=bz
Bug 1033952 - Part 2 -  Implement "Removable" and "HotSwappable" APIs for device storage. r=dhylands

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extra : amend_source : 72a032db09bbe260e07fbe497ec0558bd448f089