Bumping gaia.json for 6 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/63c677e1a4fc
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #15305 from bobsilverberg/tbpl_messages

Bug 957122 - Enable more TBPL tests - Messages app

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https://hg.mozilla.org/integration/gaia-central/rev/6d188a507d86
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 957122 - Enable more TBPL tests - Messages app

Enable test_sms_add_contact and test_sms_to_settings on TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/d2441d7f1e8f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15124 from guhelski/Bug-949801

Bug 949801 - [B2G][MMS] Service currently unavailable is prompted when d...

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https://hg.mozilla.org/integration/gaia-central/rev/877298aea3da
Author: Guilherme Uhelski <guhels@gmail.com>
Desc: Bug 949801 - [B2G][MMS] Service currently unavailable is prompted when deleting a MMS that is in the process of being sent r=julienw

Fix indentation.

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https://hg.mozilla.org/integration/gaia-central/rev/8ae4e7c061ff
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #15322 from bobsilverberg/tbpl_unit

Bug 957122 - Enable more TBPL tests - Unit tests

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https://hg.mozilla.org/integration/gaia-central/rev/c78243ad2a52
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 957122 - Enable more TBPL tests - Unit tests

Enable test_prefs on TBPL

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "bb2573a7ff5e8469df9af11f46fd4ba24f57523a", 
+    "revision": "63c677e1a4fc5714e0bd8b6fe1c383e93841500a", 
     "repo_path": "/integration/gaia-central"
 }