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

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https://hg.mozilla.org/integration/gaia-central/rev/1b9ad927701b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22689 from KevinGrandon/bug_1051061_homescreen_dragdrop_error

Bug 1051061 - [VerticalHomescreen] TypeError: this.grid._grid.dragdrop is undefined

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https://hg.mozilla.org/integration/gaia-central/rev/5e7158c07712
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1051061 - [VerticalHomescreen] TypeError: this.grid._grid.dragdrop is undefined r=djf r=Cwiiis
Bumping manifests a=b2g-bump