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

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https://hg.mozilla.org/integration/gaia-central/rev/9919e96678a4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14778 from KevinGrandon/revert_bug_948383

Bug 948383 - Move all `home button event` into GaiaDevice class

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https://hg.mozilla.org/integration/gaia-central/rev/3ec33f60adfd
Author: sashakruglov <sashakruglov@hotmail.com>
Desc: Bug 948383 - Move all `home button event` into GaiaDevice class

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https://hg.mozilla.org/integration/gaia-central/rev/c435bcc3094f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 948383 - Move all `home button event` into GaiaDevice class"

This reverts commit 4128b7c020188757eb9cc034f550cd317d9af12f.

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https://hg.mozilla.org/integration/gaia-central/rev/eca2f09899da
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "call touch_home_button from test code, not from apps"

This reverts commit 7df2c2a3cb93963a4101bba2af5669ca4732032e.

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https://hg.mozilla.org/integration/gaia-central/rev/5c80815ed38c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "fix for cards_view test"

This reverts commit b7d95bc2bfd627913edbd043d0a54f20280a4801.

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https://hg.mozilla.org/integration/gaia-central/rev/9f562f64e3d3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "fix functional tests / remove useless imports in endurance tests"

This reverts commit 25955679ea93d0feab779d9487d62b1a7b944abe.