Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ab721bdc8bc2
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1006357 - make test agent to run tests from all apps locally and in travis" for build failures

This reverts commit 0b23225f42af1497d6f998ea49f43562285bd02b.

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https://hg.mozilla.org/integration/gaia-central/rev/d66978c6fede
Author: Bebe <bebe@mozilla.ro>
Desc: Revert "Bug 976028 - test_play_ogg_video failing with libEGL.so loads twice"

This reverts commit 0413e70038c022270f712c31ce08fdefdf847d22.

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https://hg.mozilla.org/integration/gaia-central/rev/17db230b614f
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #19535 from viorelaioia/bug_976028

Bug 976028 - test_play_ogg_video failing with libEGL.so loads twice

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https://hg.mozilla.org/integration/gaia-central/rev/eccb2d3a9802
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 976028 - test_play_ogg_video failing with libEGL.so loads twice
Bumping manifests a=b2g-bump