Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5f765c6f46f5
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #12975 from Rik/xfail-contacts-928915

Bug 928915 - Mark contacts gaia-ui-tests as xfail until they are fixed. r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/1518d7712f33
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 928915 - Mark contacts gaia-ui-tests as xfail until they are fixed.

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https://hg.mozilla.org/integration/gaia-central/rev/db85b6fee428
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 923459 - [Messages] jshint fixes r=rwaldron

* down to 6 jshint errors, the remaining errors are due (imho) to issues in
  jshint
* bumped up the jshint version
* add a test to test the wbmp decoder

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https://hg.mozilla.org/integration/gaia-central/rev/87884d9045c2
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12979 from wanderview/uitest-delete-contact

Bug 928937: Fix contact lookup in test_delete_contact.py  r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/11093c98dd9b
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928937: Fix contact lookup in test_delete_contact.py

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "5d5eabb095fb415788f0038a56b59b1d94fb39e7", 
+    "revision": "5f765c6f46f59b0730e6dc34edc60159e4263ccd", 
     "repo_path": "/integration/gaia-central"
 }