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

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https://hg.mozilla.org/integration/gaia-central/rev/f6435add94e4
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15649 from gitmai/bug-963108-remove-icchelper-reference

Bug 963108 - Remove reference to icc_helper library
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/3cbaa37929dc
Author: mai <mri@tid.es>
Desc: Bug 963108 - Remove reference to icc_helper library
Bumping manifests a=b2g-bump