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

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https://hg.mozilla.org/integration/gaia-central/rev/983b7ecb17c6
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #32407 from ferjm/bug1211606.sync.enabled.pref

Bug 1211606 - Only fetch keys when Sync is enabled via "services.sync.enabled" pref changed from Gaia. r=michielbdjong

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https://hg.mozilla.org/integration/gaia-central/rev/5ba7d71007c0
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Bug 1211606 - Only fetch keys when Sync is enabled via 'services.sync.enabled' pref changed from Gaia. r= michielbdjong

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4b47f62e10f0901f2c37f2268026fd828a26b7d5", 
+        "git_revision": "8999f0ba6326d815c8366e3c1155b7e4e9763b40", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "dbaecc991635ec025860a8b2cf0c9159591fe3a4", 
+    "revision": "983b7ecb17c67b9fb511f400bb5b28b9069eea00", 
     "repo_path": "integration/gaia-central"
 }