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

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https://hg.mozilla.org/integration/gaia-central/rev/8d2dd720cd08
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #10906 from EdgarChen/bug_877978

Bug 877978 - [Gaia] Use new WebAPI to access iccInfo related attribute/event

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https://hg.mozilla.org/integration/gaia-central/rev/977de81e0fae
Author: Edgar Chen <echen@mozilla.com>
Desc: Bug 877978 - Use IccHelper to access iccInfo. r=alive,arthur,fcampo,salva

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "419504104ae75a83e3792cf0d988e53d217d63b1", 
+    "revision": "8d2dd720cd081de5c2ccd2c7762950a4212225c1", 
     "repo_path": "/integration/gaia-central"
 }