Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1317acf816b4
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #15930 from svic/Bug_964672

Bug 964672 - Don't call Pair() before sendFile() otherwise pairing dialog will be shown, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/991fefc5b1e3
Author: Arno Puder <arno@puder.org>
Desc: Bug 964672 - Don't call Pair() before sendFile() r=evelyn

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f07a6571a9515cf00b1c48a50827832e7f5549c6", 
+    "revision": "1317acf816b4756476a46aaf9bbddf1ef13f1abf", 
     "repo_path": "/integration/gaia-central"
 }