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

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https://hg.mozilla.org/integration/gaia-central/rev/52f7b7099a47
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #24567 from pivanov/bug-1065430

Bug 1065430 - [Gallery] Visual Refinements preview screenshot r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/e1f63153750f
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1065430 - [Gallery] Visual Refinements preview screenshot

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https://hg.mozilla.org/integration/gaia-central/rev/5231c7a754ab
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #24622 from mozilla-b2g/revert-23302-bug1058288

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

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https://hg.mozilla.org/integration/gaia-central/rev/82d00c07817f
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Revert "Bug 1058288 - [PDF Viewer] Update pdf.js to version 1.0.696"
Bumping manifests a=b2g-bump