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

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https://hg.mozilla.org/integration/gaia-central/rev/d5e1bc6f896c
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #19338 from russnicoletti/hidePlayer_unit_testing

Bug 979636 - Unit tests for video app, hidePlayer tests. r=johu

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https://hg.mozilla.org/integration/gaia-central/rev/dde062d89aa2
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 979636 - Unit tests for video app, hidePlayer tests
Bumping manifests a=b2g-bump