Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/85236e28eb17
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #13152 from nickdesaulniers/removeStubs

Bug 932044 - Remove PackStubTest and HostStubTest

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https://hg.mozilla.org/integration/gaia-central/rev/d7f48e1f2150
Author: Nick Desaulniers <ndesaulniers@mozilla.com>
Desc: Bug 932044 - Remove PackStubTest and HostStubTest r=fabrice