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

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https://hg.mozilla.org/integration/gaia-central/rev/3377f81fce56
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23915 from KevinGrandon/bug_1065516_invalid_self

Bug 1065516 - [System] Remove window.self in appWindow to reflect the dependency

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https://hg.mozilla.org/integration/gaia-central/rev/4c916fa57c4c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1065516 - [System] Remove window.self in appWindow to reflect the dependency r=alive
Bumping manifests a=b2g-bump