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

========

https://hg.mozilla.org/integration/gaia-central/rev/beea810aba49
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1130317 - merge pull request #28052 from mnjul:bug_1130317_dict_blob_predetermine_length to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b746bccf6af9
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1130317 - Pre-determine length of Uint8Array of Keyboard user dictionary dict blob

- The total byte length of serialized nodes can be inferred when filling each node's offset information, and is subsequently combined with header & character table size to initialize the Uint8Array total length.
- We thus avoid pushing to a JS array one-byte-by-one-byte and convert the array to Uint8Array, which should lead to better performance.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b077b97eead06bac34a7ba95eb2d77650a97ee2b", 
+        "git_revision": "3b20ace1a5456f91e750ed2a92db0b7e37098763", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "769403f166d40bac99ff0486381a55edaec5968d", 
+    "revision": "beea810aba497bde0dfeca1f9f627f5869830b08", 
     "repo_path": "integration/gaia-central"
 }