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

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https://hg.mozilla.org/integration/gaia-central/rev/52844e6a91b3
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1029336 - Only disable contextmenu for certified apps. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/45326148f6a3
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #21017 from azasypkin/bug-1026575-message-preview

Bug 1026575 - [B2G][SMS] Message preview in Messages app thread view disappears after opening app. r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/f2d3e6bc84e0
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1026575 - [B2G][SMS] Message preview in Messages app thread view disappears after opening app. r=schung
Bumping manifests a=b2g-bump