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

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https://hg.mozilla.org/integration/gaia-central/rev/2c2f2fa0a101
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #21063 from zacc/bug_1005057_app_perms

LGTM, merging as the failure from Travis is unrelated to the changes.

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https://hg.mozilla.org/integration/gaia-central/rev/f132e488ea36
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1005057 - Switch to system frame inside get/set permission test methods

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https://hg.mozilla.org/integration/gaia-central/rev/3af7d2f1dc87
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #21100 from steveck-chung/bug-1021513

Bug 1021513 - [Messages] Recipients list container scroll up automatically when dragging down. r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/3d93cbb9fa5c
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1021513 - [Messages] Recipients list container scroll up automatically when dragging down the container for multiline recipients list mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "d75252e83e48713c76466e299805ae2b35078e6a", 
+    "revision": "2c2f2fa0a101f07cbb206cca2e69ef3a7b18244c", 
     "repo_path": "/integration/gaia-central"
 }