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

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https://hg.mozilla.org/integration/gaia-central/rev/abfe3afaff64
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #14226 from flodolo/addbookmark

Bug 944784 - [l12y][browser] Bookmarks: "Edit Bookmark", use separate strings for button and dialog header

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https://hg.mozilla.org/integration/gaia-central/rev/8246e1f1cb65
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 944784 - [browser] Bookmarks: "Edit Bookmark", use separate strings for button and dialog header

Localizers could use a shorter string in the header

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "646c76b5fb2aef95c2e210e6c1e8929891da46ba", 
+    "revision": "abfe3afaff64aa3a20262e16e9feb172fa0e1222", 
     "repo_path": "/integration/gaia-central"
 }