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

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https://hg.mozilla.org/integration/gaia-central/rev/49e443173e45
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12809 from gasolin/issue-902036

Bug 902036 - [B2G][Settings][Media Storage]Spelling error on Default Med...,r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/a10f3481e3bb
Author: gasolin <gasolin@gmail.com>
Desc: Bug 902036 - [B2G][Settings][Media Storage]Spelling error on Default Media Location Information Screen

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "312d5c0596e5f34cf8f1ff1ded8e31d072e3a44c", 
+    "revision": "49e443173e45e298e1c8e0152c4abd485748fc07", 
     "repo_path": "/integration/gaia-central"
 }