Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5a43129638f3
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22178 from mikehenrty/bug-1036191-import-headers

Bug 1036191 - include font utils in import page

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https://hg.mozilla.org/integration/gaia-central/rev/d1d597ef6e34
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1036191 - include font utils in import page

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https://hg.mozilla.org/integration/gaia-central/rev/d0f6d20d3ced
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #22089 from davidflanagan/bug1041710

Bug 1041710: Ensure that wallpaper images always exactly match the size of the screen r=mhenretty, timdream

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https://hg.mozilla.org/integration/gaia-central/rev/00056526c390
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1041710: ensure that wallpaper size always exactly matches screen size

when computing screen size for wallpaper pick activity use Math.ceil to get 854 instead of 853.5 for FWVGA

Unit tests for wallpaper_manager.js plus fix a broken bootstrap test

address review comments

address review comments

remove special low-tolerance case for PNG image comparison in image_utils unit test because it caused failures on TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/630f84891042
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #22188 from sfoster/bug-1038630-tutorial-init-then-begin" for Gu bustage

This reverts commit 6ab481f9cbe4be2f6f869ff60a585df236462762, reversing
changes made to d3bef98df6343948638d81acb5c6e42e5ab6010e.
Bumping manifests a=b2g-bump