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

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https://hg.mozilla.org/integration/gaia-central/rev/e7b7d0fbefc5
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #13753 from eeejay/bug-938943

Bug 938943 - Fix Show Password checkbox in settings. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/6ad577f64a52
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 938943 - Fix Show Password checkbox in settings

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https://hg.mozilla.org/integration/gaia-central/rev/e3f4b49e72ab
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #13755 from eeejay/bug-939070

Bug 939070 - [Settings] Fix <small> selector regression from bug #914892. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/d15020bf0057
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 939070 - [Settings] Fix <small> selector regression from bug #914892