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

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https://hg.mozilla.org/integration/gaia-central/rev/e507507df0d5
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26322 from huchengtw-moz/bug-1102142-circle-button

Bug 1102142 - [Stingray][home] create circle-button and use it in Home's..., r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/bf6fc9e1fa16
Author: John Hu <johu@mozilla.com>
Desc: Bug 1102142 - [Stingray][home] create circle-button and use it in Home's search button

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "aa76ed8505bf6f5fcdd607f4b5498c101e3aab15", 
+    "revision": "e507507df0d537538322837a5b2f9e9d7c0a678b", 
     "repo_path": "integration/gaia-central"
 }