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

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https://hg.mozilla.org/integration/gaia-central/rev/7725ca500b74
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #14831 from mpizza/Bug_937487_handle_activity

Bug 937487 - Keyboard won't disappear after focusing an input and then l... r=alive.

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https://hg.mozilla.org/integration/gaia-central/rev/df2fb59f6372
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 937487 - Keyboard won't disappear after focusing an input and then launch an activity

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a384d0c712fcd8063267c09cdf430a87969948df", 
+    "revision": "7725ca500b74da11277068eb670575a59d279081", 
     "repo_path": "/integration/gaia-central"
 }