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

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https://hg.mozilla.org/integration/gaia-central/rev/ea52449e7d73
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #18243 from jimporter/camera-activity-stay-alive

Bug 994331 - [B2G][Camera] Camera dies and incoming call interface is qu...

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https://hg.mozilla.org/integration/gaia-central/rev/3ff1b62bcdc8
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 994331 - [B2G][Camera] Camera dies and incoming call interface is quickly dismissed to a banner when a call is received during video recording
Bumping manifests a=b2g-bump