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

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https://hg.mozilla.org/integration/gaia-central/rev/7a8ed4b21466
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #19167 from lhadji/1007568/copy-symlink"

This reverts commit 4d7952a408a90ff9bcee40ac1836d8c5c4a4f252, reversing
changes made to f138172949ebce82084c986867c1c6dfe66bcf3d.

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https://hg.mozilla.org/integration/gaia-central/rev/db6e559819ee
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19260 from KevinGrandon/bug_1010553_gaia_switch_component

Bug 1010553 - Create a gaia-switch web component

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https://hg.mozilla.org/integration/gaia-central/rev/8deea616697e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1010553 - Create a gaia-switch web component r=wilsonpage
Bumping manifests a=b2g-bump