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

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https://hg.mozilla.org/integration/gaia-central/rev/78dcf8d32fa5
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #11395 from oconnore/902305-clock-alarm-repeat-object

Bug 902305 - Change alarm repeat representation from a bitset to an object, r=@ian-liu

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https://hg.mozilla.org/integration/gaia-central/rev/d5cb4c0c575e
Author: Eric O'Connor <eric@bocoup.com>
Desc: Change alarm repeat data representation from a bit-string to an object.

'0000011' -> {saturday: true, sunday: true}

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "be017a4d1a4fd4abb688f425f9c69c0f74f3fda7", 
+    "revision": "78dcf8d32fa5d08de7e2527fd7824810b3bb9279", 
     "repo_path": "/integration/gaia-central"
 }