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

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https://hg.mozilla.org/integration/gaia-central/rev/bd5b53e99705
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #23286 from yor-mozilla-com/bug1058285

Bug 1058285 - [PDF Viewer] Make PDF viewer a certified app

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https://hg.mozilla.org/integration/gaia-central/rev/6f28845550c7
Author: Yan Or <yor@mozilla.com>
Desc: Bug 1058285 - [PDF Viewer] Make PDF viewer a certified app

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https://hg.mozilla.org/integration/gaia-central/rev/4e08c3336ade
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #23302 from yor-mozilla-com/bug1058288

Bug 1058288 - [PDF Viewer] Update pdf.js to version 1.0.696

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https://hg.mozilla.org/integration/gaia-central/rev/9620c46ed61c
Author: Yan Or <yor@mozilla.com>
Desc: Bug 1058288 - [PDF Viewer] Update pdf.js to version 1.0.696
Bumping manifests a=b2g-bump