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

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https://hg.mozilla.org/integration/gaia-central/rev/0b28cbe12ec7
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Merge pull request #19006 from svic/Bug_961687

Bug 961687: ShrinkingUI not sending URL. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/f3e57e858835
Author: Garner Lee <garner.lee@telekom.com>
Desc: Bug 961687: ShrinkingUI not sending URL. Fix mismatched 'transitionend' animation listener callbacks. r=gweng
Bumping manifests a=b2g-bump