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

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https://hg.mozilla.org/integration/gaia-central/rev/35ef07425e80
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #16507 from gasolin/issue-975350

Bug 975350 - [System] compress gUM image, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/60d15610a9ef
Author: vagrant <vagrant@precise64.(none)>
Desc: Bug 975350 - [System] compress gUM image
Bumping manifests a=b2g-bump