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

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https://hg.mozilla.org/integration/gaia-central/rev/eba399d3ba97
Author: Min-Zhong "John" Lu <jlu@mozilla.com>
Desc: Merge pull request #26132 from mnjul/bug_1098955_remove_inputwindow_getdpx

Bug 1098955 - Remove InputWindow._getDpx(); use Object.defineProperty to mock window.devicePixelRatio. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/494be473cbc2
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1098955 - Remove InputWindow._getDpx(); use Object.defineProperty to mock window.devicePixelRatio
Bumping manifests a=b2g-bump