Bug 915957 - Move MediaDecoder::NotifyBytesConsumed() calls into MediaResource, so we don't need to remember to do them in all decoder backends. r=kinetik
Bug 907463. Backout OP_SOURCE optimisation from bug 907926. r=mattwoodrow

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extra : rebase_source : eac66979f88c7801bc19646cf81d7c94a77281c0