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

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https://hg.mozilla.org/integration/gaia-central/rev/8c80a19ce9a0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23256 from KevinGrandon/bug_1054672_rocketbar_test_browser_chrome_new_window

Bug 1054672 - Failing rocketbar test, browser_chrome_new_window.js

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https://hg.mozilla.org/integration/gaia-central/rev/b23d93412764
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054672 - Failing rocketbar test, browser_chrome_new_window.js r=Cwiiis

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https://hg.mozilla.org/integration/gaia-central/rev/3c52cb47e2d5
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #23141 from wilsonpage/1011602

Bug 1011602 - [Contacts] Update to use <gaia-header>

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https://hg.mozilla.org/integration/gaia-central/rev/a4fc25b21c1f
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1011602 - [Contacts] Update to use <gaia-header>

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0ab25d86483aa33c73ada517156e17c759c10629", 
+    "revision": "8c80a19ce9a01276a7794db4f5779961f82cd35a", 
     "repo_path": "/integration/gaia-central"
 }