Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/3d290c631b11
Author: Donovan Preston <dpreston@mozilla.com>
Desc: Merge pull request #10874 from KevinGrandon/revert_bug_887454

Revert "bug 887454 Remove useragent override for youtube.com" r=fzzzy

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https://hg.mozilla.org/integration/gaia-central/rev/5fbf6ae01b16
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "bug 887454 Remove useragent override for youtube.com"

This reverts commit 5b5f6d8ecce794323b52daf626cee98dd7b6992e.

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https://hg.mozilla.org/integration/gaia-central/rev/05a4bc51ae6c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #10873 from asutherland/bug_852369

Bug 852369 - [Email] Support multiple email addresses in mailto links.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e079b44a5b2ca0dea9b812870fa2497f44fbf976", 
+    "revision": "3d290c631b118aacb213d80425eedae543ab3113", 
     "repo_path": "/integration/gaia-central"
 }