Bug 932281 - Extend TelemetryHistogram.{id_offset, comment_offset} to uint32_t. r=nfroyd, a=lsblakk

--HG--
extra : source : e91a4b7fbb2fcff64fefe7c6532f42a935e2183a
extra : amend_source : 5f329bbed9f07a59ccd3ccc45494ead16cd58511