Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/76ab454f8438
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #24815 from huchengtw-moz/bug-1078193

Bug 1078193 - move homescreenwindowmanager before appwindowfactory, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/fcc65ba2d1e4
Author: John Hu <im@john.hu>
Desc: Bug 1078193 - move homescreenwindowmanager before appwindowfactory

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https://hg.mozilla.org/integration/gaia-central/rev/0265c9d4d866
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #24506 from ian-liu/settings/bug1074075_refactor_bluetooth_description_in_settings_root_panel

Bug 1074075 - [Gaia][Settings][Bluetooth] Refactor Bluetooth description in settings root panel, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/aea942f8524d
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1074075 - [Gaia][Settings][Bluetooth] Refactor Bluetooth description in settings root panel

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https://hg.mozilla.org/integration/gaia-central/rev/6c49b1a94df1
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #24905 from russnicoletti/bug-1043702

Bug 1025147 - [B2G][Video]The slider overlaps the video time length when the playback ends r=russn

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https://hg.mozilla.org/integration/gaia-central/rev/3792e5cff4f0
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 1025147 - [B2G][Video]The slider overlaps the video time length when the playback ends
Bumping manifests a=b2g-bump