Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ccb40cf2c27f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21566 from schien/bug984274-fix-mochitest-permission

Bug 984274 - add required permission for mochitest. r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/ee4e3b04920c
Author: Shih-Chiang Chien <schien@mozilla.com>
Desc: Bug 984274 - add required permission for mochitest. r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/e248d4293f0c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21198 from KevinGrandon/bug_1017247_system_launch_regression

Bug 1017247 - [System] Remove on-homescreen class

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https://hg.mozilla.org/integration/gaia-central/rev/225b49af7e81
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1017247 - [System] Remove on-homescreen class r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/ebcf020b2042
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #21268 from ferjm/bug1028398.fxapermission

Bug 1028398: FxA will silently provide user's email to privileged apps i...

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https://hg.mozilla.org/integration/gaia-central/rev/c7b5f5e4ddde
Author: Fernando Jiménez <ferjmoreno@gmail.com>
Desc: Bug 1028398: FxA will silently provide user's email to privileged apps in 2.0. r=zac,arthurcc,gpg
Bumping manifests a=b2g-bump