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

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https://hg.mozilla.org/integration/gaia-central/rev/a4d81914887c
Author: John Hu <im@john.hu>
Desc: Merge pull request #30304 from john-hu/bug-1169507-focus-while-opening-closed

Bug 1169507 - Set focus while modal-dialog-will-open event fired, r=chens

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https://hg.mozilla.org/integration/gaia-central/rev/6123fddfd5a9
Author: John Hu <im@john.hu>
Desc: Bug 1169507 - Set focus while modal-dialog-will-open event fired

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "7b31544768c6e32348e4b032cf6fceefb98d90b3", 
+        "git_revision": "85e6fcef45c0cb2c017739df42b68b96cf5bb9c3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "5e79edb42ebfede069f8f38105aadd12a7dd7909", 
+    "revision": "a4d81914887c6dac8e96e149a573d22fa313444f", 
     "repo_path": "integration/gaia-central"
 }