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

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https://hg.mozilla.org/integration/gaia-central/rev/55dad48c2099
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1105519 - merge pull request #26499 from KevinGrandon:bug_1105519_battery_overlay_strings to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/bb6df9503c2c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1105519 - Remove strings from index.html for battery dialog r=kgrandon

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ff2728add4389e6bb7d48c9856ad37486e955734", 
+    "revision": "55dad48c2099b7bad629d56ebcc6ddfd5fe09a8c", 
     "repo_path": "integration/gaia-central"
 }