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

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https://hg.mozilla.org/integration/gaia-central/rev/79dc99b68d3e
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #26420 from eeejay/bug-1104198

Bug 1104198 - Make DESKTOP builds work with mulet. r=@RickyChien

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https://hg.mozilla.org/integration/gaia-central/rev/8097d9be9427
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1104198 - Make DESKTOP builds work with mulet.

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https://hg.mozilla.org/integration/gaia-central/rev/3bc577788e79
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26569 from KevinGrandon/bug_1106411_privacy_panel_role

Bug 1106411 - [PrivacyPanel] Change role to system

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https://hg.mozilla.org/integration/gaia-central/rev/d119fa23b401
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1106411 - [PrivacyPanel] Change role to system r=marta
Bumping manifests a=b2g-bump