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

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https://hg.mozilla.org/integration/gaia-central/rev/c44e5ee53a98
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1148257 - merge pull request #29438 from KevinGrandon:bug_1148257_production_check_updates to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/c7bae136bdab
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1148257 - Set checkForUpdates to true for PRODUCTION profiles

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https://hg.mozilla.org/integration/gaia-central/rev/7cd093dc268c
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1149120 - merge pull request #29425 from dominickuo:bug-1149120 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/e696a91fee92
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1149120 - [Music] Use display: block on the bdi element

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "238a425a80c5a6a6a7967ed7cc45a91bbd1508b2", 
+        "git_revision": "ca692311bddbd54b2fc7a2d507a68b2d0dd487c2", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f5342dac19db0ecab58e2e3fe8581bdfb7d6fbd1", 
+    "revision": "c44e5ee53a98f7864341c8cca6d14b05f9714b19", 
     "repo_path": "integration/gaia-central"
 }