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

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https://hg.mozilla.org/integration/gaia-central/rev/a2800243e083
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #11237 from gasolin/issue-897920

Bug 897920 - [Browser] remove redundant resource r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/cce5d8812de4
Author: gasolin <gasolin@gmail.com>
Desc: Bug 897920 - [Browser] remove redundant resource

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "cc6529f11643ec1c43130d47f732ec8091f3134e", 
+    "revision": "a2800243e083f43fad4ffce4d52e3bb5bfc1d0ee", 
     "repo_path": "/integration/gaia-central"
 }