Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/d5d7a2b06574
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #12059 from asutherland/email-resize-embedded-reload

Bug 914493 - [Email] iframe is not resized for the embedded images that were already downloaded while building body. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/a52d9ef45517
Author: praveen.singapati <praveen.singapati@lge.com>
Desc: Bug 914493 - [Email] iframe is not resized for the embedded images that were already downloaded while building body. r=asuth

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "67799bb1452a86815ddfc602c4525f093b0a3c90", 
+    "revision": "d5d7a2b06574778c07fa7bb93af4d346e639b6d0", 
     "repo_path": "/integration/gaia-central"
 }