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

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https://hg.mozilla.org/integration/gaia-central/rev/62174f4b532c
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #17364 from gasolin/bubble974828

Bug 974828 - [Settings][dsds] Outgoing data confirmation is wrong, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/764627827d38
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 974828 - [Settings][dsds] Outgoing data confirmation is wrong

- update test
- change the way about how we show confirm window
Bumping manifests a=b2g-bump