Bug 856338 - Using sequence<foo>? as an argument type crashes when passing non-null value, p=Ms2ger+smaug,r=bz

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extra : rebase_source : fb54e52db051584333c9430b0b000ee052e5b2d7
Bug 857385 - Make various JSPropertySpec arrays const.  r=waldo

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extra : rebase_source : 4ad63f7ddf8c441219bb7f30e19d66abf1747fe2
Bug 857385 - Make various JSFunctionSpec arrays const.  r=waldo

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extra : rebase_source : 24141998ffad3b0e6bad98b6fc0ce3754e448d5b