Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/cc8db684c33c
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #25365 from ADLR-es/intermittent-integration-failure

Bug 1071943 - Intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/...

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https://hg.mozilla.org/integration/gaia-central/rev/3f8de0904a93
Author: Adrián de la Rosa <hola@adlr.es>
Desc: Bug 1071943 - Intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/communications/contacts/test/marionette/ice_test.js | Contacts > ICE contacts ICE contacts Select ICE contact from search, go back to ICE settings

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https://hg.mozilla.org/integration/gaia-central/rev/51bc6cfc6391
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #25647 from RudyLu/build/Bug998106-filter_keyboard_default_layout

Bug 998106 - [B2G][Gaia][FTE][Keyboard] Selecting languages other than English during the FTE causes the associated keyboard not to load.
r=cctuan.

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https://hg.mozilla.org/integration/gaia-central/rev/78496cf02740
Author: Rudy Lu <me@rudy.lu>
Desc:  Bug 998106 - [B2G][Gaia][FTE][Keyboard] Selecting languages other than
 English during the FTE causes the associated keyboard not to load.
  - Filter out "language to layouts mappings" if the layout is not
    preloaded.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "fb277e6c27d5d94c16e9ff3b80d8b8684d7c3e18", 
+    "revision": "cc8db684c33ca52b35d987bb5bc78a4d6f090126", 
     "repo_path": "/integration/gaia-central"
 }