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

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https://hg.mozilla.org/integration/gaia-central/rev/dc9a51bd4d98
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26350 from timdream/input-mgmt-settings-default

Bug 1102141 - KeyboardHelper.getApps() should be sync if possible, r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/7b454496b46d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1102141 - KeyboardHelper.getApps() should be sync if possible

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "6d436e7dd643c6734255cfef84ee10a4722734cc", 
+    "revision": "dc9a51bd4d985bcb30c9a4413bdb5084f0f500ea", 
     "repo_path": "integration/gaia-central"
 }