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

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https://hg.mozilla.org/integration/gaia-central/rev/f2adcd661905
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #27871 from huchengtw-moz/bug-1128437-handle-session-close

Bug 1128437 - [Stingray][demo] handle session close in fling-player, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/49655827644e
Author: John Hu <johu@mozilla.com>
Desc: Bug 1128437 - [Stingray][demo] handle session close in fling-player

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https://hg.mozilla.org/integration/gaia-central/rev/e7e515c0f2fb
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1128424 - merge pull request #27947 from dwi2:bug1128424 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b8c5f6e17f88
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1128424 - Stop using deck images in smart-home and remove 'cachedIconURL'

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1e8725a92d35c06893a52d42eda34d1758ef3bb8", 
+        "git_revision": "6afe4606da768aed62d8a200fd24e6a7fa52dc4b", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9df318d546abe3c35e913cd62e951c0080cbc38f", 
+    "revision": "f2adcd661905e0f45866472840a0bba016cd1b58", 
     "repo_path": "integration/gaia-central"
 }