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

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https://hg.mozilla.org/integration/gaia-central/rev/f60550868605
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15276 from KevinGrandon/bug_959358_eme_apps_launch

Bug 959358 - [Search] Everything.me app do not launch r=me

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https://hg.mozilla.org/integration/gaia-central/rev/6e59c509dfbc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 959358 - [Search] Everything.me app do not launch

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https://hg.mozilla.org/integration/gaia-central/rev/89f07756a79c
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #15171 from nullaus/bug952707-about-net-error-orange

bug 952707

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https://hg.mozilla.org/integration/gaia-central/rev/89ba6730496d
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 952707

* Ensure error-message is visible and has been set before testing for presence of message.

r=gaye

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e9b626d1d63a8ba3394f0b68353a625ad4000a8a", 
+    "revision": "f605508686053a147c99b679a65b03cdfe9068f5", 
     "repo_path": "/integration/gaia-central"
 }