Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/cdcef109a2cf
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #25528 from RudyLu/keyboard/bug985853-hold_shift

Bug 985853 - [Keyboard UX update][User Story] Hold shift to enter upper case characters.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/4dad0ced66ce
Author: Rudy Lu <me@rudy.lu>
Desc:  - Amend the test cases.

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https://hg.mozilla.org/integration/gaia-central/rev/f0527f3a198e
Author: dxue <dxue@mozilla.com>
Desc: Bug 985853 - [Keyboard UX update][User Story] Hold shift to enter upper case characters

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "19991ffea22b068ffc3b299fbdab01bf9afc5848", 
+    "revision": "cdcef109a2cf908e8a6918b43fe6f9dbd0bd18b7", 
     "repo_path": "/integration/gaia-central"
 }