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

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https://hg.mozilla.org/integration/gaia-central/rev/44b197c0484e
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #16349 from dominickuo/bug-973086

Bug 973086 - [Music] Put nfc event registration code in ModeManager, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/b8ffbd20641f
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 973086 - [Music] Put nfc event registration code in ModeManager

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https://hg.mozilla.org/integration/gaia-central/rev/1685dbbe9ad9
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #17236 from RudyLu/keyboard/Bug975970-instantiable_touchHandler

Bug 975970 - [keyboard refactor] Convert touch_handler.js to
r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/16884c4bf753
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 975970 - [keyboard refactor] Convert touch_handler.js to
instantiable pattern.
Bumping manifests a=b2g-bump