Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/27d1e38b33eb
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "Bug 1036821 - git commit hash isn't wrote to settings/resources/gaia_commit.txt on Windows"

This reverts commit 6b6c77c2a1b93deab5466744bb857b37ec755567.

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https://hg.mozilla.org/integration/gaia-central/rev/142a658bd3d3
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "Bug 1039739 - Add some logging when writing the git commit id into the settings app;r=yurenju"

This reverts commit 8d0f21f728c837276b2ad3484213f623622c81bf.

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https://hg.mozilla.org/integration/gaia-central/rev/f3e5599b7202
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "Bug 1039739 - Make it more clear what command we're executing;r=yuren"

This reverts commit 74caef0139574c7fcf2c77255df9088f44a4dafe.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "bf1a57f891c0a04d05ec1121a581db92a6d1e691", 
+    "revision": "27d1e38b33eb89a39627cb0848106aa6feb0992e", 
     "repo_path": "/integration/gaia-central"
 }