Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/0156ae94101c
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #11723 from lightsofapollo/revert-clock

Revert "Bug 907177 - [Clock] Add integration tests r=ianliu"

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https://hg.mozilla.org/integration/gaia-central/rev/2ffc4fc3feb9
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Bug 907177 - [Clock] Add integration tests r=ianliu"

This reverts commit 55e465002133776a0700022b0bd9b629f6f7772d.