Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7249ac6102b1
Author: Evan Tseng <itoyxd@gmail.com>
Desc: Merge pull request #32465 from evanxd/bug-1199420

Bug 1199420 - Wait for mozbrowserloadstart to get allowedAudioChannels r=alwu

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https://hg.mozilla.org/integration/gaia-central/rev/570d8afe1cc1
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1199420 - Wait for mozbrowserloadstart to get allowedAudioChannels r=alwu

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https://hg.mozilla.org/integration/gaia-central/rev/5b3133269f81
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #32467 from arcturus/bug-1203762-2

Bug 1203762 - [Contacts] Images disappear when user enables and disab…

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https://hg.mozilla.org/integration/gaia-central/rev/a267ccdfc22c
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1203762 - [Contacts] Images disappear when user enables and disables order by last button inside the contacts list. part-2 r=ferjm

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "20f795aaa4c98a87b8fb595a3dbaa91c340d0fc3", 
+        "git_revision": "fbf31b7de795e104ca16221a5c38a60b8d7a34b8", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "6f90ed0a8e9ace5feee2d1fa351bed303112834a", 
+    "revision": "7249ac6102b132302b6a55736255c41dd996c100", 
     "repo_path": "integration/gaia-central"
 }