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

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https://hg.mozilla.org/integration/gaia-central/rev/7b11320c6026
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #10968 from huchengtw-moz/camera/Bug_881664_camera_pick_pitfall

Bug 881664 - Camera 'pick' pitfall when there is no sdcard. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/8e86897ac0d8
Author: John Hu <johu@mozilla.com>
Desc: Bug 881664 - Camera 'pick' pitfall when there is no sdcard

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a391d9b3c4c39c6851ffd68e3985caff35d904bf", 
+    "revision": "7b11320c60264fc82adf668a3972f90e50de9c5a", 
     "repo_path": "/integration/gaia-central"
 }