Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4cc16f542ae3
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1029385 - Rewrite app-makefile rule in javascript r=ochameau" for gaia-unit failures in wappush_test.js

This reverts commit 4a207609f6f45085d5acbd8520baddc8c6d2b88b.

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https://hg.mozilla.org/integration/gaia-central/rev/155a1bdfb8e7
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #22979 from evelynhung/issue-m039154

Bug 1039154 - handle provisioning document format error, r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/d7e482543cb8
Author: Evelyn Hung <jj.evelyn@gmail.com>
Desc: Bug 1039154 - handle provisioning document format error

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https://hg.mozilla.org/integration/gaia-central/rev/20f1d07c7f92
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #22194 from jrburke/bug1021981-email-toast-visuals-2

Bug 1021981 - [email] Update toast display to 2.0 visual redesign r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/2ef8dc5a1f51
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1021981 - [email] Update toast display to 2.0 visual redesign

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9d7eb000470ac5e678a7b77bd2ebed0adb512097", 
+    "revision": "4cc16f542ae3e226eca44a9a1f7e30d26b55fc76", 
     "repo_path": "/integration/gaia-central"
 }