Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8c59f102e8fe
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17608 from KevinGrandon/bug_988007_compose_styling

Bug 988007 - Unable to place cursor in front of the first character on a line r=asuth

========

https://hg.mozilla.org/integration/gaia-central/rev/d192dd0118c3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 988007 - Unable to place cursor in front of the first character on a line r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/7e0333b78df9
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 986173 - Disable the reflow test for now

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4a044ffb9bfab3939040350ca4ca4606ca5c862b", 
+    "revision": "8c59f102e8fe16503c9c869402033f2299cd2fbe", 
     "repo_path": "/integration/gaia-central"
 }