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

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https://hg.mozilla.org/integration/gaia-central/rev/8d251544bd7b
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1156214 - merge pull request #29673 from punamdahiya:Bug1156214 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/f33728ca4ed9
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug 1156214 - [Music] Display Play Pause buttons when opening music from Settings Downloads list r=djf

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "116e22f64fcc6cc58f9323ea234544b982156141", 
+        "git_revision": "c6dc81d9fabeb663147ca282353bc854e00dec9a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "7fe7e2654559890fdade6fc6647671137b35ae0a", 
+    "revision": "8d251544bd7bf7f458b269b6d47b9a979ebd2052", 
     "repo_path": "integration/gaia-central"
 }