Bug 1037100 - Remove all use of ScopedDeleteArray from media/.  r=ekr

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extra : rebase_source : 0f32325b868e5e07b0d2966aea7057a940004be9
Bug 1047123 - ThreadStackHelper should use UniquePtr<uint8_t[]>, not ScopedDeleteArray.  r=jchen

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extra : rebase_source : 11aec2ba0c908a5ad892b832db130a84c562566b
Bug 1037103 - Remove ScopedDeleteArray from Scoped.h.  r=jcranmer