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

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https://hg.mozilla.org/integration/gaia-central/rev/f07e8b6a3df5
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #20087 from sfoster/bug-939174-upgrade-tutorial

Bug 939174 - Launch whats new FTU tutorial to demo edge gestures etc. r=borjasalguero,alive

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https://hg.mozilla.org/integration/gaia-central/rev/001056cd5522
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 939174 - Launch whats new FTU tutorial to demo edge gestures etc. r=borjasalguero,alive

* Add shared VersionHelper
* Unit tests for VersionHelper, FTULauncher
* Check device.previous_os in FTULauncher/FTU app
* Launch full ftu when ftu.enabled always
* Launch ftu whats new tutorial when upgrade detected
* Add config for 1.3-2.0 upgrade tutorial

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4c7b6effecf47bb19ed9f001a4cbe909c17e9456", 
+    "revision": "f07e8b6a3df5c70280d647ef69e8cf1c70018fb3", 
     "repo_path": "/integration/gaia-central"
 }