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

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https://hg.mozilla.org/integration/gaia-central/rev/da6be4c77e54
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14445 from pivanov/bug-947095

Bug 947095 - [Email] Update to new light 1.3 tool bar design

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https://hg.mozilla.org/integration/gaia-central/rev/27cf8ac00b4b
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947095 - [Email] Update to new light 1.3 tool bar design

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https://hg.mozilla.org/integration/gaia-central/rev/f7d525bc9297
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14449 from pivanov/bug-947104

Bug 947104 - [Music] Update to new 1.3 tab bar visual design

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https://hg.mozilla.org/integration/gaia-central/rev/ccebd25a7121
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947104 - [Music] Update to new 1.3 tab bar visual design

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https://hg.mozilla.org/integration/gaia-central/rev/3c1c7938854f
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14450 from pivanov/bug-947106

Bug 947106 - [Browser] Update toolbar in browser to updated 1.3 visual designs

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https://hg.mozilla.org/integration/gaia-central/rev/70ff5fd6f1dd
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947106 - [Browser] Update toolbar in browser to updated 1.3 visual designs