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

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https://hg.mozilla.org/integration/gaia-1_4/rev/c78692af1f20
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #20326 from russnicoletti/Bug-1002593-v1.4

Port Bug 1002593 to v1.4 r=djf

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https://hg.mozilla.org/integration/gaia-1_4/rev/5efb238c70cb
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Port 1002593 to 1.4
Bumping manifests a=b2g-bump