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

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https://hg.mozilla.org/integration/gaia-central/rev/7fc18e9b1de5
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19378 from zacc/bug_1016216

Bug 1016216 - Re-enable test_active_sync_* on-device tests

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https://hg.mozilla.org/integration/gaia-central/rev/fb70bda4da6e
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1016216 - Re-enable test_active_sync_* on-device tests

========

https://hg.mozilla.org/integration/gaia-central/rev/bc0076c2cfa9
Author: Evan Xd <itoyxd@gmail.com>
Desc: Revert "Bug 1007546 - Visual refresh for Add/Edit event view"

This reverts commit aec6ddd4df64567d7d7113146bebfcd0bc16f6db.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "eaf862a530e05c8a9cd2b57f8d8e70e2d25d5cd9", 
+    "revision": "7fc18e9b1de5b72e9bf30b5822a47933a5581e40", 
     "repo_path": "/integration/gaia-central"
 }