Bug 891884 - toBlob should support the quality parameter as toDataURL does r=joedrew sr=mrbkap
Bug 894948 - Remove effectively-dead analysis-related code from interpreter. r=jandem

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extra : rebase_source : b1cd7b3232a2541d2282609cb698d6c9f825e3be
extra : amend_source : 97483ece12c0750e9fcff906ffdf6321617c106d