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

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https://hg.mozilla.org/integration/gaia-central/rev/b26ac118fa83
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #11381 from etiennesegonzac/telephony-helper-tests

Bug 883276 - Cover the TelephonyHelper with unit tests.

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https://hg.mozilla.org/integration/gaia-central/rev/1e7a4ae29bf8
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 883276 - Cover the TelephonyHelper with unit tests.
r=julienw

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "13332352a031a45f0dabcbedf6d221e58d5cdd2d", 
+    "revision": "b26ac118fa8330654bbe6e3baa96dd08d1f99f31", 
     "repo_path": "/integration/gaia-central"
 }