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

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https://hg.mozilla.org/integration/gaia-central/rev/55774dacb8b4
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #21472 from mikehenrty/bug-994079-integration-test

Bug 994079 - integration tests for mozApps.getSelf

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https://hg.mozilla.org/integration/gaia-central/rev/5b8d2268c90c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 994079 - integration tests for mozApps.getSelf

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "adbcadf9674c8b687d71ef3e421534a14f3b2b4d", 
+    "revision": "55774dacb8b43f28516e671bc211c15290485380", 
     "repo_path": "/integration/gaia-central"
 }