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

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https://hg.mozilla.org/integration/gaia-central/rev/642dc3493c7d
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23055 from mikehenrty/bug-1054442-removep-fte-progress

Bug 1054442 - Remove progress bar from FTE

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https://hg.mozilla.org/integration/gaia-central/rev/d1d6fa9e1bce
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1054442 - Remove progress bar from FTE

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https://hg.mozilla.org/integration/gaia-central/rev/e1198d11c5e8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22808 from hobinjk/browser-settings

Bug 938177 - Browser Settings Moved to System Settings

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https://hg.mozilla.org/integration/gaia-central/rev/4e34b99fc688
Author: James Hobin <jhobin@mozilla.com>
Desc: Bug 938177 - Browser Settings Moved to System Settings; r=arthurcc,evelyn,timdream

Creates and improves UI for changing System Browser settings in Settings
app. Adds various data clearing buttons and moves default search engine
location.
Bumping manifests a=b2g-bump