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

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https://hg.mozilla.org/integration/gaia-central/rev/219b3363067d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #21865 from jmcanterafonseca/fix_loop_contacts

Bug 1017756 - Update Loop buttons & state (color, name, visibility...) i...

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https://hg.mozilla.org/integration/gaia-central/rev/c7f10d482742
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1017756 - Update Loop buttons & state (color, name, visibility...) in contact details when a branding/UX decision is taken

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https://hg.mozilla.org/integration/gaia-central/rev/e487a23b7756
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1034565 - CSSLint complains about CSS Variables r=vingtetun

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c037df86639747e8c73be93d07fe06d0e8b9d7f3", 
+    "revision": "219b3363067d20330cfd24f65c77067ca94768fd", 
     "repo_path": "/integration/gaia-central"
 }