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

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https://hg.mozilla.org/integration/gaia-central/rev/5da7dcb85b62
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #20661 from zacc/bug_1026424_bookmark

Bug 1026424 - Remove explicit frame switching in Browser tests, rely on ...

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https://hg.mozilla.org/integration/gaia-central/rev/80a3c07d7ffb
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1026424 - Remove explicit frame switching in Browser tests, rely on atom instead

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https://hg.mozilla.org/integration/gaia-central/rev/1b95cc967aae
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20576 from etiennesegonzac/bug-1017416-forward-touch-to-activities

Bug 1017416 - Make sure the ringtones app is included in the stack r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/6527d1498c96
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1017416 - Make sure the ringtones app is included in the stack so the touch event forwarding works.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3b7db4e019c80af821ec0d888ae7bfaacbc9352a", 
+    "revision": "5da7dcb85b623881c91d9ff997deb14c06a16ccd", 
     "repo_path": "/integration/gaia-central"
 }