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/eeac1467a585
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #12906 from snowmantw/v1.2

Merge pull request #12784 from snowmantw/issue925635

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https://hg.mozilla.org/integration/gaia-1_2/rev/7e9789547691
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #12784 from snowmantw/issue925635

Bug 925635 - [LockScreen] Fix the track to match the icons(cherry picked from commit 41334990d9b7cfbb9415916c23f6930f2ddf63dc)