Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f68c738657b7
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1130654 - merge pull request #28074 from jmcanterafonseca:fix_bluetooth_export to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/4c4dc5e04814
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1130654 - [Contacts][Export] Email and Messages contact share activity are erroneously placed under Bluetooth export selection.

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https://hg.mozilla.org/integration/gaia-central/rev/dffb02bad841
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1132215 - merge pull request #28175 from ADLR-es:clear-button to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/4151fe15e840
Author: Adrián de la Rosa <adriantovick@gmail.com>
Desc: Bug 1132215 - [Contacts][New/Edit] The 'Clear' button below the Phone Number field does not function.

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https://hg.mozilla.org/integration/gaia-central/rev/89882b58ae15
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #28098 from cctuan/1131442

Bug 1131442 - Scan GAIA_APPDIRS with js

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https://hg.mozilla.org/integration/gaia-central/rev/54103129dbc8
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1131442 - Scan GAIA_APPDIRS with js

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "71defd569502274e877b56094e3a44d776033120", 
+        "git_revision": "dbbb9b0be9c30b96146cd1259ed6d6f8c8eaadf3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "59488903252981b50ff1d73fa5652332a2ca7fc3", 
+    "revision": "f68c738657b797affb53adc8d62247d85279fa61", 
     "repo_path": "integration/gaia-central"
 }