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

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https://hg.mozilla.org/integration/gaia-1_4/rev/6602388429fb
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #20622 from gittup/bug-917630-v1.4

Bug 917630 - Allow unlimited keypresses when on a call r=etienne

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https://hg.mozilla.org/integration/gaia-1_4/rev/f75bc0d97a6d
Author: Mike Shal <marfey@gmail.com>
Desc: Bug 917630 - Allow unlimited keypresses when on a call
Bumping manifests a=b2g-bump