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

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https://hg.mozilla.org/integration/gaia-central/rev/b010c31264fb
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #14960 from yurenju/build-integration-test

Bug 953099 - Use mocha for integration test on build system r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/a608b291db55
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 953099 - Use mocha for integration test on build system

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f4de4fb2054365cf38fd57f21a82c755c414ac95", 
+    "revision": "b010c31264fb0838a5540b8d2b283518ad5217ce", 
     "repo_path": "/integration/gaia-central"
 }