Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/18e16a8b3be1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26704 from KevinGrandon/bug_1109308_debug_test_tc

Bug 1109308 - Due to font-rendering inconsistencies, check the difference instead of equality

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https://hg.mozilla.org/integration/gaia-central/rev/fdf7d72bc78f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1109308 - Due to font-rendering inconsistencies, check the difference instead of equality

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "40dbaf70ab741867a276c8f1fe3eea6f164052a9", 
+    "revision": "18e16a8b3be10311e7b26ab3883693d5451ea0c9", 
     "repo_path": "integration/gaia-central"
 }