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

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https://hg.mozilla.org/integration/gaia-central/rev/fab92321f729
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #15472 from dmarcos/bug961070

Bug 961070 - [Camera] Addressing code comments after bug 959890 merge

========

https://hg.mozilla.org/integration/gaia-central/rev/5c89849105f0
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 961070 - [Camera] Addressing code comments after bug 959890 merge

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "73633b623dfd4568732cc386759594a9b5b6bfc9", 
+    "revision": "fab92321f7293d7e09c67ab04dd97d5b2101635a", 
     "repo_path": "/integration/gaia-central"
 }