Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7877d548097b
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 968661 - Extract new build module webapp-shared.js from webapp-zip.js" for breaking B2G desktop builds

This reverts commit a572887e1a8595a3a43af79037192c4818729f85.

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https://hg.mozilla.org/integration/gaia-central/rev/a95c69e76dd1
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18225 from zacc/bug_988316

Bug 988316 - enable/disable wifi n gaiatest is polluting the global wifi...

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https://hg.mozilla.org/integration/gaia-central/rev/15a42e7bbbcd
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 988316 - enable/disable wifi n gaiatest is polluting the global wifi scopeope and stopping airplane mode from working correctly
Bumping manifests a=b2g-bump