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

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https://hg.mozilla.org/integration/gaia-1_4/rev/f213864544e8
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18370 from viorelaioia/bug_986662_v1.4

[v1.4] Bug 986662 - Delete some redundant tests

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https://hg.mozilla.org/integration/gaia-1_4/rev/0ce00e52f44f
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986662 - Delete app object methods

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https://hg.mozilla.org/integration/gaia-1_4/rev/e2c05ba35a79
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986662 - Delete tests
Bumping manifests a=b2g-bump