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

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https://hg.mozilla.org/integration/gaia-central/rev/4f9a0f287ac6
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1122431 - merge pull request #29286 from sean2449:Bug_1122431-dialog-box to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/c8bf12970f7d
Author: Sung Chiu <suchiu@mozilla.com>
Desc: Bug 1122431 - [Stingray] UI-Transition - Change app modal dialog to TV UI spec

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https://hg.mozilla.org/integration/gaia-central/rev/cf5c65fdf1dc
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1155097 - merge pull request #29593 from EragonJ:bug-1155097 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/9bd011190dab
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1155097 - fixed passcode CSS with -moz-padding-start

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "3be562701d5b276ff2ac46a5e9fbd63a9b378d4d", 
+        "git_revision": "6edbddca827ac892831e241c250a0a2d0d171dbe", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ae88940e41787598d004efa532c3383a2f8f0107", 
+    "revision": "4f9a0f287ac6196275c53fce16115daf68f89bad", 
     "repo_path": "integration/gaia-central"
 }