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

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https://hg.mozilla.org/integration/gaia-central/rev/9a72bfab6b39
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1115213 - merge pull request #28226 from mikehenrty:bug-1115213-rtl-stop-resume-dl to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b4b5320b3af2
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1115213 - Fix download pause/resume icons in RTL

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "dc92f3fc3465bbbd3596790bc2afa4e120f4cfbd", 
+        "git_revision": "404bbb2cefb34241e0e4aa1b1fea2ddd51c0d7bc", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8c74e8d99ee464adeadccf6822cae93a93451e4b", 
+    "revision": "9a72bfab6b3929ffd49802eadeeb0009eabdecbb", 
     "repo_path": "integration/gaia-central"
 }