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

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https://hg.mozilla.org/integration/gaia-central/rev/1c2a9f12dc45
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #11522 from steveck-chung/Bug-898726

Bug 898726 -[SMS]Manual inputed receiver's phone number will be overrided after select receiver from contacts. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/8327c30888ec
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 898726 -[SMS]Manual inputed receiver's phone number will be overrided after select receiver from contacts

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b1c24376938a0d487679913fcb7bc12879deb6b0", 
+    "revision": "1c2a9f12dc455ae671b15d8eb9d49ee901d4e3a6", 
     "repo_path": "/integration/gaia-central"
 }