Bug 769871 - Remove x_CheckThisX methods, as the extract-the-primitive-value methods immediately after perform that check already.  r=Norbert

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extra : rebase_source : b4dd0efb5acad176a07ac8c1dada64dddd0dc3a9
Bug 837957 - Implement ICU dependent functions of Intl.Collator, Intl.NumberFormat, Intl.DateTimeFormat (part 9).  r=jwalden

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extra : rebase_source : 26a601e1ee905437403c3005d932e6f9fd9dc9c9
Bug 837957 -  Implement ICU dependent functions of Intl.Collator, Intl.NumberFormat, Intl.DateTimeFormat (cleanup).  r=jwalden

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extra : rebase_source : 8adc5d1feb27ccd24eef30c1a7b6b4a2e7f6e91a