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

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https://hg.mozilla.org/integration/gaia-central/rev/147461ea236c
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #11086 from dominickuo/bug-893724

Bug 893724 - Adopt all build flags in Android.mk for all subsequent re-builds, r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/f144c701abaf
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 893724 - Adopt all build flags in Android.mk for all subsequent re-builds