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

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https://hg.mozilla.org/integration/gaia-central/rev/e7458acd8980
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #13894 from gitmai/bug-937244-add-reset-buttons

Bug 937244 -[Cost Control] Add different buttons to delete data usage re...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/b8ed1469656f
Author: mai <mri@tid.es>
Desc: Bug 937244 -[Cost Control] Add different buttons to delete data usage related with Wi-Fi and Mobile