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

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https://hg.mozilla.org/integration/gaia-central/rev/1d7a49e94c98
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19014 from KevinGrandon/bug_971443_system2_accessibility

Bug 971443 - [System2] Instantiable Accessibility

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https://hg.mozilla.org/integration/gaia-central/rev/41ba942afebb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971443 - [System2] Instantiable Accessibility r=alive

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5476e49adf00cafde6cb68e876f0514dac4b993d", 
+    "revision": "1d7a49e94c987d380b6439eb310c4a60d50b25b3", 
     "repo_path": "/integration/gaia-central"
 }