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

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https://hg.mozilla.org/integration/gaia-central/rev/c55d4ca164d0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18846 from KevinGrandon/bug_971543_system2_instantiable_rocketbar

Bug 971543 - [System2] Make Rocketbar instantiable

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https://hg.mozilla.org/integration/gaia-central/rev/50c83e7e3821
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971543 - [System2] Make Rocketbar instantiable r=benfrancis

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5b7dbc28c71bd5e8da989df05701e279c5ec8fe4", 
+    "revision": "c55d4ca164d059cc7c6288e18939ebeebaddb0aa", 
     "repo_path": "/integration/gaia-central"
 }