Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/55bf0b4ae518
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #10704 from wanderview/contacts-tests-timing

Bug 888498: Make contacts test less time sensitive. r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/46c45b6f36bf
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 888498: Make contacts test less time sensitive

This patch essentially removes all setTimeout() calls and replaces them
with event listener's on 'listRendered'.  To avoid future timing problems
it also uses this technique with as many of the load() calls as possible.