Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f43b7d39e02c
Author: rnowm <arnau@arnaumarch.com>
Desc: Revert "Merge pull request #19445 from nucliweb/1003080-Stroke-circles"

This reverts commit e5c7a881d61068611edd98d717fe1d627f3685f8, reversing
changes made to 5c137c9cae57c245215ba42ec565b571dc6f3b41.

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https://hg.mozilla.org/integration/gaia-central/rev/745fb428e932
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #19285 from tamarahills/bugfix/980394

Bug 980394 - Removes references to mozMobileConnection and references mozMobileConnections in the call screen and dialer. r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/9c7ce40a927b
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 980394 - Removes references to mozMobileConnection and references mozMobileConnections in the call screen and dialer.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2f81103e1731d9504ce700e0d4fa60237749a058", 
+    "revision": "f43b7d39e02ca0d7f414657edfe6a6d3347efddc", 
     "repo_path": "/integration/gaia-central"
 }