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

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https://hg.mozilla.org/integration/gaia-central/rev/7741006ce04c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15600 from Pike/bug-962535-build-downloads-private

bug 962535, make downloads of the build system private

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https://hg.mozilla.org/integration/gaia-central/rev/85dc8c0b5b4b
Author: Axel Hecht <axel@pike.org>
Desc: bug 962535, make downloads of the build system private
By marking the download.source as private, the toolkit module won't try
to add it to history in current gecko versions. And history fails.

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https://hg.mozilla.org/integration/gaia-central/rev/f78cae134704
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15621 from dwilsoncaf/bug-960756-master

Bug 960756 - Add CONFIG_MAX_SNAPSHOT_PIXEL_SIZE. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/8cc046f2ec91
Author: Diego Wilson <dwilson@codeaurora.org>
Desc: Bug 960756 - Add CONFIG_MAX_SNAPSHOT_PIXEL_SIZE. r=djf

This allows configuration of the max resolution of camera snapshots
independently from the max resolution of displayed images.
Bumping manifests a=b2g-bump