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

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https://hg.mozilla.org/integration/gaia-central/rev/6cf9084da407
Author: gitmai <mri@tid.es>
Desc: Merge pull request #14578 from gitmai/bug-948824-CC-remove-icchelper

Bug 948824 - [CostControl] [DSDS] Remove IccHelper
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/ed89cbccaa72
Author: mai <mri@tid.es>
Desc: Bug 948824 - [CostControl] [DSDS] Remove IccHelper