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

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https://hg.mozilla.org/integration/gaia-central/rev/66fce84c558a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20602 from crdlc/bug-1026075

Bug 1026075 - App Delete confirm screen does not use building blocks

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https://hg.mozilla.org/integration/gaia-central/rev/8cbac843999a
Author: crdlc <crdlc@tid.es>
Desc: Bug 1026075 - App Delete confirm screen does not use building blocks

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https://hg.mozilla.org/integration/gaia-central/rev/cfe77f8c9cd6
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #20591 from hfiguiere/bug971438

Bug 971438 - Re-enable constcontrol perf test. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/9d2a87d18fee
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 971438 - Re-enable constcontrol perf test.
Bumping manifests a=b2g-bump