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

========

https://hg.mozilla.org/integration/gaia-central/rev/58804c21cd21
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #13532 from gaye/lightsofapollo-bug-832258-hide-sync-button

Bug 832258 - Hide sync button r=gaye

========

https://hg.mozilla.org/integration/gaia-central/rev/5084eda4abd4
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge branch 'bug-832258-hide-sync-button' of https://github.com/lightsofapollo/gaia into lightsofapollo-bug-832258-hide-sync-button

Conflicts:
	apps/calendar/js/views/settings.js

========

https://hg.mozilla.org/integration/gaia-central/rev/540bc492232a
Author: James Lal <james@lightsofapollo.com>
Desc: Show/hide sync button when account is added/removed

========

https://hg.mozilla.org/integration/gaia-central/rev/a51cd8a2c98f
Author: James Lal <james@lightsofapollo.com>
Desc: Store.Account#syncableAccounts

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "73ad695024d19067b7f4cfeb7408dbad4db6efdb", 
+    "revision": "58804c21cd21a37dc611078e8b8717ce0f85c6dd", 
     "repo_path": "/integration/gaia-central"
 }