Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/1b27c1b2ad96
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13735 from crh0716/938262

Bug 938262 - Set default selection based on the current permission setting r=evelyn

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https://hg.mozilla.org/integration/gaia-1_2/rev/92cfded7c3c6
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 938262 - Set default selection based on the current permission setting