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

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https://hg.mozilla.org/integration/gaia-central/rev/79ddb80647ce
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21466 from khuey/1035432

Bug 1035432 - InitLogoHandler entrains the DOM nodes used to display the logo. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/255ffc1aa8c5
Author: Kyle Huey <khuey@kylehuey.com>
Desc: Bug 1035432: Don't entrain the startup logos. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/8da1e68d73a6
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #21411 from RudyLu/keyboard/Bug1027979_remove_PendingSymbols

Bug 1027979 - Remove more dead code from keyboard app.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/60dbeaccfa55
Author: Rudy Lu <me@rudy.lu>
Desc:  Bug 1027979 - Remove more dead code from keyboard app.
  - Remove the pendingSymbols relate code.
Bumping manifests a=b2g-bump