Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/17c49bd866e1
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 942307 - Escape and newline custom browser prompts. r=fabrice

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "d2bf202524fead93de606755a4d1c9e3c771e90c", 
+    "revision": "17c49bd866e10bb5a5240c333f354cc577e9d94e", 
     "repo_path": "/integration/gaia-central"
 }