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

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https://hg.mozilla.org/integration/gaia-central/rev/37bba2830c85
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14134 from pivanov/bug-941628

Bug 941628 - [Settings] Update background and sub header colour

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https://hg.mozilla.org/integration/gaia-central/rev/2b3a8e5e730a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 941628 - [Settings] Update background and sub header colour

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0b54df4bf7d1b0cc022c350d465352b51b83fe86", 
+    "revision": "37bba2830c857871eee027405c0a19ffde8c8c62", 
     "repo_path": "/integration/gaia-central"
 }