Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/fbfb6288914b
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1047143 - close aps entering task-manager, exitToApp to open/restore" for causing leaks on b2g-inbound

This reverts commit 450be0707d124ad06f15cd0dda1dd03ce2051fa6.

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https://hg.mozilla.org/integration/gaia-central/rev/e1c263804467
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #23341 from gasolin/issue-1059050

Bug 1059050 - fix jsdoc build errors, timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e00b5c8b1c2d
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1059050 - fix jsdoc build errors

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3177a8da3157456079fefecb87d3a344d3b2ebc6", 
+    "revision": "fbfb6288914bcb279d78d83331f55ea1cc2e5400", 
     "repo_path": "/integration/gaia-central"
 }