Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/344bc62a70a6
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #10479 from yurenju/hidpi

Bug 881127 - Used GAIA_DEV_PIXELS_PRE_PX instead of HIDPI r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d06788f435b3
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 881127 - Used GAIA_DEV_PIXELS_PRE_PX instead of HIDPI r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/ee6cb3a038a6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #10497 from KevinGrandon/bug_869383_remove_homescreen_port

Bug 869383 - Remove extra colon

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https://hg.mozilla.org/integration/gaia-central/rev/29be2fbdb4f2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 869383 - Remove extra colon