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

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https://hg.mozilla.org/integration/gaia-central/rev/78519c0cfe8f
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1007709 - [Dialer][Call Screen] Create fluid size for contact name in the upper information panel" for gaia unit test failures

This reverts commit 70e78c013d3b1d3f461fb5c23c724c177c8dc3c4.
Bumping manifests a=b2g-bump