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

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https://hg.mozilla.org/integration/gaia-central/rev/739d9e049ea1
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 972245 - Photos can appear distorted in the call log and in the SMS app(SMS part) r=julien
Bumping manifests a=b2g-bump