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

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https://hg.mozilla.org/integration/gaia-1_3/rev/19b170e51932
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16890 from alivedise/bugzilla/977934_v1.3/render-activity-inside-caller

Bug 977934 - Render activity inside caller

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https://hg.mozilla.org/integration/gaia-1_3/rev/9daae8acbdbb
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 977934 - Render activity inside caller
Bumping manifests a=b2g-bump