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

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https://hg.mozilla.org/integration/gaia-central/rev/b0252a5e2c49
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #18186 from pivanov/bug-994745

Bug 994745 - [VDR][Wallpaper] Apply Buttons and Input areas [BB]

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https://hg.mozilla.org/integration/gaia-central/rev/bb11cee9514c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 994745 - [VDR][Wallpaper] Apply Buttons and Input areas [BB]
Bumping manifests a=b2g-bump