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

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https://hg.mozilla.org/integration/gaia-2_0/rev/535011ee012f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/7724baa4af38
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive" for JS exceptions

This reverts commit e13cc05b6d615664d769e55b60754480848d076b.
Bumping manifests a=b2g-bump