Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/16f2c422168a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #31076 from etiennesegonzac/bug-1186587

Bug 1186587 - Don't ensure() the homescreen for every Service.query('getHomescreen') r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/a07514594ec2
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1186587 - Don't ensure() the homescreen for every Service.query('getHomescreen') r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/7a1268191b9d
Author: Giovanny Andres Gongora Granada <gioyik@gmail.com>
Desc: Bug 1170465 - [System] fix remaining jsdoc errors r=kgrandon

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ec2199b324304d3678b6a98a08a31bdc13c9e984", 
+        "git_revision": "db299103dd17a873cba4ff88e62ec173bf80fe62", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8d48ae501c1ccc26fd2160388fb6094756924da0", 
+    "revision": "16f2c422168acd350ff048a22d39297e60508059", 
     "repo_path": "integration/gaia-central"
 }