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

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https://hg.mozilla.org/integration/gaia-central/rev/31b05353667b
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #17260 from russnicoletti/bug980581

Bug 980581 - Previous video clip title remains when a new video clip is ...

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https://hg.mozilla.org/integration/gaia-central/rev/a60b6d8fadac
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 980581 - Previous video clip title remains when a new video clip is selected
Bumping manifests a=b2g-bump