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

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https://hg.mozilla.org/integration/gaia-central/rev/3004264248cc
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #10867 from wanderview/unit-test-script

Bug 891366: Provide unit test script and make target. r=mwu

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https://hg.mozilla.org/integration/gaia-central/rev/304aef72c600
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 891366: Provide unit test script in gaia/bin

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "015185f797c407b83fdc51d0f731a533be1ca0a5", 
+    "revision": "3004264248cc5114ca75603e679f375724d26c9e", 
     "repo_path": "/integration/gaia-central"
 }