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

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https://hg.mozilla.org/integration/gaia-2_0/rev/bd42e1a3b6b0
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1030248 - Use native context menu in the search app. r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_0/rev/6e5d4a4ac7fd
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1030248 - Use native context menu in the search app. r=kgrandon"

This reverts commit 43226cf5c3ad19728a88b3786595670b6d60e5c6.
Bumping manifests a=b2g-bump