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

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https://hg.mozilla.org/integration/gaia-central/rev/cf4b0a357338
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #25336 from Rik/symlink-1085414

Bug 1085414 - Allow apps that are symbolically linked to be unit tested r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/0b9674230d50
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1085414 - Allow apps that are symbolically linked to be unit tested

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https://hg.mozilla.org/integration/gaia-central/rev/93cf2223627f
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #25343 from arcturus/test-themes

Bug 1074107 - Add wallpaper test themes to dev-apps r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/7a8b6c884298
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 1074107 - Add wallpaper test themes to dev-apps. r=fabrice

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4a4698b5efbfc72cffaa8f69a89d245966b65abe", 
+    "revision": "cf4b0a357338df1049852b07ffee0649de069325", 
     "repo_path": "/integration/gaia-central"
 }