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

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https://hg.mozilla.org/integration/gaia-central/rev/3320c4f90ffb
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #9905 from NeerajSeth/bug-817909

[Settings-Phone Lock] "confirm passcode" field accepts invalid entries, ...r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/34b2010670a1
Author: Neeraj Kumar <neeraj_kumar@hcl.com>
Desc: [Settings-Phone Lock] "confirm passcode" field accepts invalid entries, if you previously typed correct value and then backspaced some of it

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https://hg.mozilla.org/integration/gaia-central/rev/05d8d85f4a15
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #10386 from leob2g/Bug_834148_volume_up_key_skips_vibrate_when_moving_up_20130614

Bug 834148 - move from silent to vibrate instead of volume 1 when moving up, r=alive, a=leo+

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https://hg.mozilla.org/integration/gaia-central/rev/7df2ca443036
Author: hanj.kim <hanj.kim@lge.com>
Desc: Bug 834148 - move from silent to vibrate instead of volume 1 when power up button is pressed on silent

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b406627a0838957e791b588509925cf1e85e1b2f", 
+    "revision": "3320c4f90ffb0c372f06f7b72d14b54ce0f7a138", 
     "repo_path": "/integration/gaia-central"
 }