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

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https://hg.mozilla.org/integration/gaia-central/rev/8aa934cd6409
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20543 from julienw/1016504-call-teardown-on-mocks

Bug 1016504 - Intermittent system/test/unit/bootstrap_test.js | system/B...

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https://hg.mozilla.org/integration/gaia-central/rev/807c1f53560e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1016504 - Intermittent system/test/unit/bootstrap_test.js | system/Bootstrap "after all" hook | TypeError: navigator.mozL10n is undefined (http://system.gaiamobile.org:8080/js/internet_sharing.js?time=XXX) r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/639726a3c915
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20649 from KevinGrandon/bug_1026814_fix_rtl

Bug 1026814 - Disable RTL for homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/9507971f0609
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1026814 - Disable RTL for homescreen r=crdlc

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ce46df1367d06bd221b174c09c190e5beccb7f17", 
+    "revision": "8aa934cd6409c5d83446942315143989bc2232e0", 
     "repo_path": "/integration/gaia-central"
 }