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

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https://hg.mozilla.org/integration/gaia-central/rev/ff61343c5774
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #27826 from gaye/es6-polyfill

Bump gaia node modules to higher rev to get es6-polyfill

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https://hg.mozilla.org/integration/gaia-central/rev/42e6cf7a8b9f
Author: gaye <gaye@mozilla.com>
Desc: Bump gaia node modules to higher rev to get es6-polyfill

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "e326cae79e977a340864048d86b56ac480971cc9", 
+        "git_revision": "086fd4fb372232baf8bec8480d199719d3d206c9", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "4a0f4e26afccce9606ded6013006b99210e80f4e", 
+    "revision": "ff61343c57743a897665e133a183f118dbe56a86", 
     "repo_path": "integration/gaia-central"
 }