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

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https://hg.mozilla.org/integration/gaia-central/rev/4a2e3f0b25b8
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1161990 - merge pull request #30152 from dwi2:bug1161990 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/cf3269cc6e94
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1161990 - [Stingray] Write content of folder immediately when folder changes

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "655ecfd48bf67156c36ffacd74441e03a48524c1", 
+        "git_revision": "f5c5da84832b4d0976cdc68afed7886b96cd4d9c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "5671a26de7c21f7864f304daf7efa5e9d12d4546", 
+    "revision": "4a2e3f0b25b82dc1d13f59965c1f07517331db98", 
     "repo_path": "integration/gaia-central"
 }