Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c7b07c667231
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23844 from oklang/Bug_1064735-Theme_apps_should_be_hidden_on_homescreen

Bug 1064735 - Theme apps should be hidden on homescreen. r=21

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https://hg.mozilla.org/integration/gaia-central/rev/8ec752b23ce0
Author: Olle Klang <olle.klang@sonymobile.com>
Desc: Bug 1064735 - Theme apps should be hidden on homescreen.

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https://hg.mozilla.org/integration/gaia-central/rev/cdcfaffc2b9b
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23694 from yfdyh000/937367

Bug 937367 - Fix links broken in Legal Information. r=ehung

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https://hg.mozilla.org/integration/gaia-central/rev/dd3d243061dd
Author: YFdyh000 <yfdyh000@gmail.com>
Desc: Bug 937367 - Fix links broken in Legal Information

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https://hg.mozilla.org/integration/gaia-central/rev/abc6f44f13fb
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #23899 from gasolin/issue-1065271

Bug 1065271 - [settings] help panel code cleanup, r=arhtur

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https://hg.mozilla.org/integration/gaia-central/rev/84eaded748e7
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1065271 - [settings] help panel code cleanup

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https://hg.mozilla.org/integration/gaia-central/rev/4f44c9478754
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #23769 from gmarty/Bug-1063026-Music-player-refinments

Bug 1063026 - [Utility Tray] Refinements to Music player on utility tray...

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https://hg.mozilla.org/integration/gaia-central/rev/11e7c0d81618
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1063026 - [Utility Tray] Refinements to Music player on utility tray and lockscreen
Bumping manifests a=b2g-bump