Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/220a5b34a145
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #18697 from hfiguiere/bug846909-take3.5

Bug 846909 - Inject performance helper atom with marionette r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/eca938aa64cb
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 846909 - Part 2: remove some debug messages. Use Object.defineProperty()

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https://hg.mozilla.org/integration/gaia-central/rev/4a6c1a1f2a08
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 846909 - Inject performance helper atom with marionette
Bumping manifests a=b2g-bump