Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/e1fe725fa481
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1074499 - Check setCallingLineIdRestriction directly instead of using hasOwnProperty

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https://hg.mozilla.org/integration/gaia-2_1/rev/70f568383348
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1072805 - The [Cancel] button was misaligned in the IME menu.

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https://hg.mozilla.org/integration/gaia-2_1/rev/6bf6e9679d54
Author: Maliha-Momtaz-Islam <malihaislam81@gmail.com>
Desc: Bug 1072458 - Certain characters cannot be input using Bangla keyboard
Bumping manifests a=b2g-bump