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

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https://hg.mozilla.org/integration/gaia-central/rev/016c549625cf
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21747 from pivanov/bug-1035716

Bug 1035716 - [Email] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/9777d1f529f1
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035716 - [Email] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/c391fcdf3bbe
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21486 from kamituel/Bug_1021267_smart_posters

Bug 1021267: Handle smart posters in the same way as URI records. r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/ee9a3264fa1b
Author: Kamil Leszczuk <kamituel@gmail.com>
Desc: Bug 1021267: Handle smart posters in the same way as URI records
Bumping manifests a=b2g-bump