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

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https://hg.mozilla.org/integration/gaia-central/rev/062734437b62
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14512 from KevinGrandon/bug_948045_enable_media_queries_responsive

Bug 948045 - Enable device-* media queries in responsive mode for gaia r=paul

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https://hg.mozilla.org/integration/gaia-central/rev/40bde610f4b3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 948045 - Enable device-* media queries in responsive mode for gaia