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

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https://hg.mozilla.org/integration/gaia-central/rev/b04eea7a2d68
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #19331 from hfiguiere/bug837669

Bug 837669 - ready test-perf in setting, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/cf36659fd504
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 837669 - Part 2: startup-path-done performance event for settings

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https://hg.mozilla.org/integration/gaia-central/rev/cc4e2389a368
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 837669 - Part 1: Rename the "start" perf event for the wifi list test.
Bumping manifests a=b2g-bump