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

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https://hg.mozilla.org/integration/gaia-central/rev/4de872072386
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13358 from davidflanagan/bug932556

Bug 932556: increase default max image size for camera and gallery to a full 5 megapixels r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/4d5cfea8a61b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 932556: increase default max image size for camera and gallery to a full 5 megapixels

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https://hg.mozilla.org/integration/gaia-central/rev/63f0c46c4b6b
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13401 from crdlc/bug-935087

[Download Manager] Download list view skeleton

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https://hg.mozilla.org/integration/gaia-central/rev/82b96a351386
Author: crdlc <crdlc@tid.es>
Desc: [Download Manager] Download list view skeleton