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

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https://hg.mozilla.org/integration/gaia-central/rev/c6e4cebeec81
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #23510 from Rik/integration-test-followup-1047356

Bug 1047356 -  Modify the call log user interface to link to the call in... r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/4195a9e9c6a0
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1047356 -  Modify the call log user interface to link to the call information page

Modify the selector to find the menu item with the new way we construct it.

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https://hg.mozilla.org/integration/gaia-central/rev/3d9bf081f29b
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23502 from jrburke/bug1060475-email-debug-1-setup

Bug 1060475 - [email] DEBUG=1 in firefox nightly not working with emailjs changeset r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/3780474dd567
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1060475 - [email] DEBUG=1 in firefox nightly not working with emailjs changeset

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a6cc4e349d0ed9e8b9d75db4352d6745f13959ce", 
+    "revision": "c6e4cebeec81ae620f366fe627d5c5dd4e9fd39d", 
     "repo_path": "/integration/gaia-central"
 }