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

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https://hg.mozilla.org/integration/gaia-central/rev/21652299e037
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Revert "Merge pull request #19504 from justindarc/bug1008349"

This reverts commit c16d56833586c34be586aee357f860b890039a3d, reversing
changes made to 43d26d9f869d62616b217b8c68b21d02e1a8da5b.

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https://hg.mozilla.org/integration/gaia-central/rev/08f70c0f0cc0
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #19504 from justindarc/bug1008349

Bug 1008349 - [B2G][Camera][Zoom][Open C]zoom level in preview is higher...

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https://hg.mozilla.org/integration/gaia-central/rev/4c0c7df92b6c
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1008349 - [B2G][Camera][Zoom][Open C]zoom level in preview is higher than the zoom level of the picture taken.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "58fe6b7c3ae4a47176bcb64ee1e2b162906827c5", 
+    "revision": "21652299e03788cc0a8481cdab94718ac7b42dda", 
     "repo_path": "/integration/gaia-central"
 }