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

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https://hg.mozilla.org/integration/gaia-central/rev/a5d3d79908c1
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23461 from crdlc/bug-1059234

Bug 1059234 - Import sim contacts message not displayed on FTU after imp...

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https://hg.mozilla.org/integration/gaia-central/rev/90b99649ad9c
Author: crdlc <crdlc@tid.es>
Desc: Bug 1059234 - Import sim contacts message not displayed on FTU after importing contacts

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https://hg.mozilla.org/integration/gaia-central/rev/076589e485ef
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #23557 from etiennesegonzac/bug-1060693

Bug 1060693 - Make sure isFullScreen()/isFullScreenLayout() always returns a boolean r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/b7d641edf4e8
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1060693 - Make sure isFullScreen()/isFullScreenLayout() always returns a boolean.
Since we're using the results to do some classList.toggle('', bool)

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1eb1d0a6b91119c3b4b187123151676022eddf2e", 
+    "revision": "a5d3d79908c1590d1cdb9c463193ba18c23ae653", 
     "repo_path": "/integration/gaia-central"
 }