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

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https://hg.mozilla.org/integration/gaia-1_4/rev/e879d5bbfe89
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #18097 from alivedise/bugzilla/990802_v1.4/incorrect-open-close-animation

Bug 990802 - Remove animation class correctly, r=timdream

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https://hg.mozilla.org/integration/gaia-1_4/rev/aa1a94217db7
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 990802 - Remove animation class correctly
Bumping manifests a=b2g-bump