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

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https://hg.mozilla.org/integration/gaia-1_4/rev/25f97d9f9f0f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17465 from mikehenrty/1.4-reflow-uplift

Bug 982196 - Upgrading the ReflowHelper to use the new devtools tooling. a=TEST_ONLY

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https://hg.mozilla.org/integration/gaia-1_4/rev/d0ad2f9130cd
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 982196 - Upgrading the ReflowHelper to use the new devtools tooling.
r=gaye,janx
Bumping manifests a=b2g-bump