Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7d3e97220e38
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #20585 from zbraniecki/1022889-pretranslation-blacklist

Bug 1022889 - Introduce pretranslation blacklist. r=stas

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https://hg.mozilla.org/integration/gaia-central/rev/cc64708caf87
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1022889 - Introduce pretranslation blacklist

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https://hg.mozilla.org/integration/gaia-central/rev/c38f8b1ff3e8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1021496 - Follow-up, add grid_icon_renderer to example r=me

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9ec621e1aa7d49b4a280b49c94447cc45f1daf0c", 
+    "revision": "7d3e97220e38f799d82f7da78a8a55d060dd09ba", 
     "repo_path": "/integration/gaia-central"
 }