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

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https://hg.mozilla.org/integration/gaia-central/rev/8c5152866a35
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12604 from jmcanterafonseca/fix_facebook_messaging

Bug 910112 - [B2G][Contacts]When click message button for facebook a con...

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https://hg.mozilla.org/integration/gaia-central/rev/a4704080ab42
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 910112 - [B2G][Contacts]When click message button for facebook a contact, it prompt this contact is not existed.

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https://hg.mozilla.org/integration/gaia-central/rev/20e63f10ec72
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12580 from jmcanterafonseca/fix_activity_matching

[B2G] [Buri] [Dialer] Attempts to create a contact with the phone number...

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https://hg.mozilla.org/integration/gaia-central/rev/29a905dd8497
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: [B2G] [Buri] [Dialer] Attempts to create a contact with the phone number of another contact fails

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https://hg.mozilla.org/integration/gaia-central/rev/0e0180b57049
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12576 from crdlc/bug-922611

Bug 922611 - Avoid dock repainting while swiping from second to first page

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https://hg.mozilla.org/integration/gaia-central/rev/a24656bd785d
Author: crdlc <crdlc@tid.es>
Desc: Bug 922611 - Avoid dock repainting while swiping from second to first page

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "30eb00123212b2506c5a359bdebc9644a625f2bf", 
+    "revision": "8c5152866a355a6379fa459f523063dcd8f0f20e", 
     "repo_path": "/integration/gaia-central"
 }