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

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https://hg.mozilla.org/integration/gaia-central/rev/cc70720e762e
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #14525 from karlt/942751

bug 942751 - stop OscillatorNodes when done to work around bug 897796 r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/b8d13e7fdc17
Author: Karl Tomlinson <karlt+@karlt.net>
Desc: bug 942751 - stop OscillatorNodes when done to work around bug 897796

This patch also reverts to the behavior of the prior mozWriteAudio
implementation where stop() only stops long presses, allowing short presses to
release appropriately.

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https://hg.mozilla.org/integration/gaia-central/rev/c29b6c9fc9db
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #14171 from EverythingMe/944068-collection-style

[Bug 944068] Revise collection style [r=crdlc]

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https://hg.mozilla.org/integration/gaia-central/rev/d1c095651389
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 944068] Revise collection style [r=amirn]

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "93f6c433742b74d1e7151b42b09a049167129646", 
+    "revision": "cc70720e762e7ce315fd84b07a261e4a682705ab", 
     "repo_path": "/integration/gaia-central"
 }