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

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https://hg.mozilla.org/integration/gaia-central/rev/78ab0bc3aaa5
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #19206 from wilsonpage/1008371

Bug 1008371 - [B2G][Camera][1.4] Camera remains in a faux recording state when

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https://hg.mozilla.org/integration/gaia-central/rev/cf070eadf1bb
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1008371 - [B2G][Camera][1.4] Camera remains in a faux recording state when pressing record followed by sleep

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https://hg.mozilla.org/integration/gaia-central/rev/36a7526a918d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18563 from azasypkin/bug-895484-share-url

Bug 895484 - [SMS] Handle a share URL activity

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https://hg.mozilla.org/integration/gaia-central/rev/76db9f81f7a4
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 895484 - [SMS] Handle a share URL activity. r=julien
Bumping manifests a=b2g-bump