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

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https://hg.mozilla.org/integration/gaia-central/rev/462149120f00
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #29002 from stasm/1136321-negative-rtl

Bug 1136321 - Add dir=auto to text and search inputs

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https://hg.mozilla.org/integration/gaia-central/rev/2aa2fb77e7f2
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1136321 - Add dir=auto to text and search inputs

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "d5fb945b48069a6745c60617e3203e3f9ca3ea01", 
+        "git_revision": "8712ff718817f647a40d021ac1c9495ada21f51f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b9be3efc55d074d39f155fa975fa10bfa1b58489", 
+    "revision": "462149120f002a1074483b63e9671627607d0594", 
     "repo_path": "integration/gaia-central"
 }