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

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https://hg.mozilla.org/integration/gaia-central/rev/26ded672c50d
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #33014 from Cwiiis/bug1221195-homescreen-remove-system-xhr

Bug 1221195 - Remove unused systemXHR permission. r=gmarty,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9ab903b69575
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1221195 - Remove unused systemXHR permission. r=gmarty,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/bfa623f8e4e0
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #32954 from samgiles/distro-vars

Bug 1220744 - Allow specific distros to set/unset build time variables in their own config r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/2fea90f31ddc
Author: Sam Giles <sam.e.giles@gmail.com>
Desc: Bug 1220744 - Allow specific distros to set/unset build time variables in their own config r=timdream

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "db4dabf9b3932fcfccd078fde6bac2d56624d2d9", 
+        "git_revision": "ccc064c3d32bc9bb6787e768a761055f4fb69769", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "3d74b9cdd47d30c9c8e490f4a4b7cba7f3bbe53e", 
+    "revision": "26ded672c50d86852555b32c9ceee6a338262400", 
     "repo_path": "integration/gaia-central"
 }