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

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https://hg.mozilla.org/integration/gaia-central/rev/aac07cb753d6
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #13964 from wanderview/contacts-imgloader-timeout

Bug 942397: Throttle setTimeout calls in imgLoader.  r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/7fe4c4f94279
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 942397: Throttle setTimeout calls in imgLoader.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "5e9bc3560ed0ec8f442559d0c8ac9e831fa82d7c", 
+    "revision": "aac07cb753d6c364c3cbd39ad8116d455d5adf01", 
     "repo_path": "/integration/gaia-central"
 }