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

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https://hg.mozilla.org/integration/gaia-central/rev/3f54f719dc14
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #18359 from huchengtw-moz/gallery/Bug_997051-master

Bug 997051 - [Gallery] the MAX_IMAGE_SIZE in inline viewer doesn't not u...

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https://hg.mozilla.org/integration/gaia-central/rev/3390760fc46a
Author: John Hu <johu@mozilla.com>
Desc: Bug 997051 - [Gallery] the MAX_IMAGE_SIZE in inline viewer doesn't not use customization config value
Bumping manifests a=b2g-bump