Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/28e05fba4e74
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16365 from chirarobert/fix_sms_notif

Bug 973598 - Fix test_sms_notification intermittent failure

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https://hg.mozilla.org/integration/gaia-central/rev/35f8d35581d0
Author: chirarobert <chirarobert@yahoo.com>
Desc: Bug 973598 - Fix test_sms_notification intermittent failure
Added a wait for the homescreen to fully load  before sending the sms.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "916544475538c82002f7a3de699a2df50d13e2e0", 
+    "revision": "28e05fba4e74324906b17de618ec7fb28583ce89", 
     "repo_path": "/integration/gaia-central"
 }