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

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https://hg.mozilla.org/integration/gaia-central/rev/c041fbb3644d
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #19177 from mikehenrty/bug-968483-rnowm

Bug 968483 rnowm

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https://hg.mozilla.org/integration/gaia-central/rev/2ae6e9b6cae9
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 968483 - Fixes to increaded back button size, python tests

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https://hg.mozilla.org/integration/gaia-central/rev/4cbdf6405a47
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 968483 - [Building Blocks] Update header design to accommodate larger back-button

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "26a239d804014b0c94f13dc80da23d7556bbdff9", 
+    "revision": "c041fbb3644d1e50cffe82b01356401883ccc8ad", 
     "repo_path": "/integration/gaia-central"
 }