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

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https://hg.mozilla.org/integration/gaia-central/rev/7a3acb50fd99
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #15310 from arcturus/bug-953098

Bug 953098 - [Fugu][Contact] Search bar is unavailable after deleting co...

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https://hg.mozilla.org/integration/gaia-central/rev/98da7902359d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 953098 - [Fugu][Contact] Search bar is unavailable after deleting contact in the search results

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https://hg.mozilla.org/integration/gaia-central/rev/e83044769b40
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15314 from dwilsoncaf/bug-947504-master

Bug 947504 - Only enable HwcComposer2D by default if hardware support it

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https://hg.mozilla.org/integration/gaia-central/rev/2fad337e28ff
Author: Diego Wilson <dwilson@codeaurora.org>
Desc: Bug 947504 - Only enable HwcComposer2D by default if hardware support it

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https://hg.mozilla.org/integration/gaia-central/rev/f09c0eb1dfb1
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15244 from allstarschh/Bug958423

Bug 958423 - ndef in 'nfc-manager-tech-discovered' is two levels

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https://hg.mozilla.org/integration/gaia-central/rev/fb390c0fe430
Author: allstars.chh <allstars.chh@gmail.com>
Desc: Bug 958423 - ndef in 'nfc-manager-tech-discovered' is two levels of array.