Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/62a9d42b9525
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 969215 - Execute |make| should only build specific apps we modified" for build bustage

This reverts commit 45533309ff1688b1193ebde82a31b7e4914f8fbb.
Bumping manifests a=b2g-bump