Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/302b622d781c
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #11173 from gasolin/issue-887670sdp

Bug 887670 - [Test][System] Unit test for SpinDatePicker, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/67564a09ab9e
Author: gasolin <gasolin@gmail.com>
Desc: Bug 887670 - [Test][System] Unit test for SpinDatePicker

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https://hg.mozilla.org/integration/gaia-central/rev/ae21684b855f
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #11152 from gasolin/issue-887670vp

Bug 887670 - [Test][System] Unit test for Value Picker, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/fd6ac317518a
Author: gasolin <gasolin@gmail.com>
Desc: Bug 887670 - [Test][System] Unit test for Value Picker

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f2454e95b24f028b6ebc1b1edb880c12f80454de", 
+    "revision": "302b622d781c996bfe79959db431d02b17c605a7", 
     "repo_path": "/integration/gaia-central"
 }