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

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https://hg.mozilla.org/integration/gaia-central/rev/d327e9514a8b
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18420 from zacc/bug_997679

Bug 997679 - Remove marionette calls where session may not exist (in the...

========

https://hg.mozilla.org/integration/gaia-central/rev/97b30d930d7a
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 997679 - Remove marionette calls where session may not exist (in the event of a crash)

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1cd16812e3656293313ab7791697bf91908393ad", 
+    "revision": "d327e9514a8b8e44ef9fd89c5d8d6d21b3853485", 
     "repo_path": "/integration/gaia-central"
 }