Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/cffb8e7efe8a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22504 from KevinGrandon/bug_1048629_remove_haida_flag

Bug 1048629 - Remove rocketbar.enabled setting

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https://hg.mozilla.org/integration/gaia-central/rev/aed32eb077b6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1048629 - Remove HAIDA setting from build scripts R=alive R=yurenju F=sfoster

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https://hg.mozilla.org/integration/gaia-central/rev/6aec0bd4b583
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22590 from vingtetun/low.battery.red

Bug 1049759 - Low battery indicator on the browser chrome titlebar is no...

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https://hg.mozilla.org/integration/gaia-central/rev/62df7c175df3
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1049759 - Low battery indicator on the browser chrome titlebar is not red. r=kgrandon

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "aa934b82734277331ead4666fa115b6cfedbdaae", 
+    "revision": "cffb8e7efe8a20181c00289e2d027326702c460c", 
     "repo_path": "/integration/gaia-central"
 }