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

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https://hg.mozilla.org/integration/gaia-central/rev/f00199917c08
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16608 from timdream/keyboard2-keyboard

Bug 975971 - [keyboard refactor] Convert input_field.js/autocorrect.js/shiftkey.js to instantiable pattern, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/9ae528b30aa2
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 975971 (part 3) - [keyboard refactor] Convert autocorrect.js to instantiable pattern

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https://hg.mozilla.org/integration/gaia-central/rev/da039013121b
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 975971 (part 2) - [keyboard refactor] Convert shiftkey.js to instantiable pattern

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https://hg.mozilla.org/integration/gaia-central/rev/a523c8a85d70
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 975971 - [keyboard refactor] Convert input_field.js to instantiable pattern
Bumping manifests a=b2g-bump