Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/811fa208a183
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26733 from timdream/keyboard-db-service

Bug 1110028 - Introduce InputMethodDatabaseLoader for IMEngines, r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/81b94674fe22
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1110028 - Part II, Let latin engine use it

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https://hg.mozilla.org/integration/gaia-central/rev/7426f3be6118
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1110028 - Part I, InputMethodDatabaseLoader and glue

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https://hg.mozilla.org/integration/gaia-central/rev/376c8e681b0b
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1110028, Part Zero, Fix how latin.js tests executes
Bumping manifests a=b2g-bump