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

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https://hg.mozilla.org/integration/gaia-1_4/rev/1643d240c056
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19512 from bzbarsky/fix-the-tests

Bug 1013999.  Add the various crud sinon.js will stick on the window for...

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https://hg.mozilla.org/integration/gaia-1_4/rev/b32f2af4b6db
Author: Boris Zbarsky <bzbarsky@mit.edu>
Desc: Bug 1013999.  Add the various crud sinon.js will stick on the window for us to the mocha.js whitelist of stuff on the window.
Bumping manifests a=b2g-bump