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

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https://hg.mozilla.org/integration/gaia-central/rev/933d2df50c71
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14091 from pivanov/bug-939222

Bug 939222 - [Action Icons - Video] Remove shadows from action icons

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https://hg.mozilla.org/integration/gaia-central/rev/360ab811684a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 939222 - [Action Icons - Video] Remove shadows from action icons