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

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https://hg.mozilla.org/integration/gaia-1_4/rev/b143fbab135d
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 995605 - [Sora][Message][MMS]Can't add the text in content when forward a media MMS r=schung

The issue is that in compose.js, "pointer-events: none" is added after it's
removed, in this case.

This patch ensures that SMIL.parse always calls the callback in an asynchronous way,
so that the caller does not have any surprise.

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https://hg.mozilla.org/integration/gaia-1_4/rev/891e99cd633d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18660 from timdream/fix-trust-ui-fxa-1.4

Bug 993273 - Ensure FxA dialog is created hidden +shepherd

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https://hg.mozilla.org/integration/gaia-1_4/rev/c67a456d6297
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 993273 - Ensure FxA dialog is created hidden
Bumping manifests a=b2g-bump