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

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https://hg.mozilla.org/integration/gaia-central/rev/07d05d6ae274
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13542 from pivanov/bug-933206

Bug 933206 - [Status Bar] Update Battery Icons, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/a5643a6755af
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 933206 - [Status Bar] Update Battery Icons