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

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https://hg.mozilla.org/integration/gaia-central/rev/8af07726968d
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #14204 from Rik/change-reporter-944279

Bug 944279 - Use the spec reporter for all mocha suites r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/2bb8d22fd0d0
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 944279 - Use the spec reporter for all mocha suites

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0a71c1f82f78e48653da8537331675b71185ece6", 
+    "revision": "8af07726968dd634315bdbc154406faf97778675", 
     "repo_path": "/integration/gaia-central"
 }