Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c600a2871b21
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #20368 from arcturus/bug-1023908

Bug 1023908 - [Contacts] Disable interminent integration test r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/9db605e46a0e
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 1023908 - [Contacts] Disable interminent integration test

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https://hg.mozilla.org/integration/gaia-central/rev/88fa6799f71d
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #20234 from crdlc/bug-1022390

Bug 1022390 - [Vertical] Cancel download of apps

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https://hg.mozilla.org/integration/gaia-central/rev/7144e5a59a2b
Author: crdlc <crdlc@tid.es>
Desc: Bug 1022390 - [Vertical] Cancel download of apps

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b8275b26a982d0ef0ecb666526f9bccf99a331dd", 
+    "revision": "c600a2871b21ae6fcfbf5b0fc4a6fd4b4fd8a73c", 
     "repo_path": "/integration/gaia-central"
 }