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

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https://hg.mozilla.org/integration/gaia-central/rev/d63153e0dfd7
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #15972 from comoyo/bug968122

Bug 968122 - Add default styles for homescreen dialogs. r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/6586dc320892
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 968122 - Add default styles for homescreen dialogs

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https://hg.mozilla.org/integration/gaia-central/rev/1f0044cc39be
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16073 from flodolo/bug968069_monththumbnail

Bug 968069 - [Gallery] Make header (month date) localizable in thumbnail view

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https://hg.mozilla.org/integration/gaia-central/rev/c0ba26bf4a67
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 968069 - Make header (month date) localizable in thumbnail view

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https://hg.mozilla.org/integration/gaia-central/rev/f81ef18075b0
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16205 from timdream/browser-hires-icon

Bug 971652 - Browser lost it's icon after re-install, r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/619c31205832
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 971652 - Browser lost it's icon after re-install

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "ef983063519c1e7ed9151aa96ca531ebda03b5ce", 
+    "revision": "d63153e0dfd76903d376ead65633331b486580ff", 
     "repo_path": "/integration/gaia-central"
 }