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

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https://hg.mozilla.org/integration/gaia-central/rev/1bc735f80cca
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #14597 from dominickuo/bug-947443

Bug 947443 - [music] Only init the communication when music is not in picker mode, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/69833d0efc81
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 947443 - [music] Only init the communication when music is not in picker mode

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https://hg.mozilla.org/integration/gaia-central/rev/40ec150b627a
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #15103 from RudyLu/keyboard/Bug942651-arabic_no_uppercase

Bug 942651 - Not to do "upperCase" conversion for Arabic keyboard layout...
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/0dd4760b8cf6
Author: Ahmed Nefzaoui <nefzaoui.ahmed@hotmail.com>
Desc: Bug 942651 - Not to do "upperCase" conversion for Arabic keyboard layout.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8983baf77549a33a1df7dbe71dcdab3eaf0f7b94", 
+    "revision": "1bc735f80cca0fee83f3654bdd4b0a24b32ec6a4", 
     "repo_path": "/integration/gaia-central"
 }