Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b289dcbf92b8
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1033223 - disable bookmark_uninstall_test.js for failures in Travis r=kgrandon-on-irc

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https://hg.mozilla.org/integration/gaia-central/rev/7f7d024f899f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21800 from KevinGrandon/bug_1039180_statusbar_icon_fix

Bug 1039180 - [System] Fix statubar upper positioning

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https://hg.mozilla.org/integration/gaia-central/rev/60ae2fbb3a23
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1039180 - [System] Fix statubar upper positioning r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/51d1d90e1cef
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #21810 from EverythingMe/homeicons

Bug 1039311 - [Collection] HomeIcons Singleton (refactor)

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https://hg.mozilla.org/integration/gaia-central/rev/acfb8e38ee56
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1039311 - [Collection] HomeIcons Singleton (refactor)

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "89e0c53c16eca222ef5d802168e4be098f48675e", 
+    "revision": "b289dcbf92b80c6275bffb2b0996da8b75a2ac78", 
     "repo_path": "/integration/gaia-central"
 }