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

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https://hg.mozilla.org/integration/gaia-central/rev/67a2c3020e0b
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21497 from bebef1987/ftu

Bug 1035838 - Assert via settings API that debug.performance_data.shared...

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https://hg.mozilla.org/integration/gaia-central/rev/66a46b454ccb
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1035838 - Assert via settings API that debug.performance_data.shared is set in FTU

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https://hg.mozilla.org/integration/gaia-central/rev/34e8c2511972
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21432 from viorelaioia/bug_924835

Bug 924835 - Create a test for receiving a call with a locked screen

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https://hg.mozilla.org/integration/gaia-central/rev/0d0182794811
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 924835 - Create a test for receiving a call with a locked screen
Bumping manifests a=b2g-bump