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

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https://hg.mozilla.org/integration/gaia-1_4/rev/1c3c0ff488eb
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17880 from AndreiH/bug_990985

Bug 990985 - [master][v1.4] Let's xfail test_settings_airplane_mode.Test...

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https://hg.mozilla.org/integration/gaia-1_4/rev/07280d3bde93
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 990985 - [master][v1.4] Let's xfail test_settings_airplane_mode.TestAirplaneMode
Bumping manifests a=b2g-bump