Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/6a508a816bad
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #11110 from dominickuo/bug-896580

Bug 896580 - Enable the done button before nocrop is set. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/2365946acfeb
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 896580 - Enable the done button before nocrop is set

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9c7d3db26da317a50fecaa63349de604fcd12cb5", 
+    "revision": "6a508a816badce57fe3f6e043b012b6cfd1f5352", 
     "repo_path": "/integration/gaia-central"
 }