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

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https://hg.mozilla.org/integration/gaia-central/rev/6dd77fac0df4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24900 from KevinGrandon/bug_1054716_software_home_nofification_banners

Bug 1077579 - [SoftwareHome] Add integration tests for system banner, coverage for bug 1054716

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https://hg.mozilla.org/integration/gaia-central/rev/068ea9c2f229
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1077579 - [SoftwareHome] Add integration tests for system banner, coverage for bug 1054716 r=eli r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/2977e6a0c7d1
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #24456 from jrburke/bug1073356-calendar-wobbly-refresh

Bug 1073356 - [Calendar] Wobbly Refresh Icon Animation r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/f3f80aece509
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1073356 - [Calendar] Wobbly Refresh Icon Animation

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f1a64972d9562d7a1213e34cd966424cce8b597a", 
+    "revision": "6dd77fac0df43e69ed37e0758bf14832cd143ce1", 
     "repo_path": "/integration/gaia-central"
 }