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

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https://hg.mozilla.org/integration/gaia-central/rev/dbc540265f83
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #29360 from crh0716/1151723

Bug 1151723 - Use 'window' explicitly r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/0dbf84de91b1
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1151723 - Use 'window' explicitly

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4aeaae4b3cc08709544685e13a7e80a6cda409df", 
+        "git_revision": "a290b11627ec2b7c25980f5687a98da86641cfe4", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "869fab213deefa9f40f96cb826f71b4740875742", 
+    "revision": "dbc540265f837510772bbcfdc7e9181b280b2551", 
     "repo_path": "integration/gaia-central"
 }