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

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https://hg.mozilla.org/integration/gaia-central/rev/773ea4fa868f
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #17964 from nullaus/bug981539

bug 981539

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https://hg.mozilla.org/integration/gaia-central/rev/35440e2554b6
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 981539

* Handle new error for no disk space.

r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/a25c8a19e49d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17803 from jmcanterafonseca/export_bday_vcard

Bug 989909 - vcard Export / Import does not deal with birthday and anniv...

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https://hg.mozilla.org/integration/gaia-central/rev/46027f8d00e3
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 989909 - vcard Export / Import does not deal with birthday and anniversary

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1c4cb51103918927ba1431bd2c26b0506ce7402e", 
+    "revision": "773ea4fa868f849eedb8ab55453ef7d497c03db9", 
     "repo_path": "/integration/gaia-central"
 }