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

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https://hg.mozilla.org/integration/gaia-central/rev/077af36fcd81
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #19602 from iFadey/bug-990047

Bug 990047 - Add a shared function to load JSON files r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/660356be13c6
Author: Fawad Hassan <ifadey@ymail.com>
Desc: Bug 990047 - Add a shared function to load JSON files and use it throughout gaia to replace the existing ad-hoc functions

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5dac72950cbe5f0bc0977f32ad206b5acacb625a", 
+    "revision": "077af36fcd812af55571fce5060a76e92f41688c", 
     "repo_path": "/integration/gaia-central"
 }