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

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https://hg.mozilla.org/integration/gaia-central/rev/e2c86f978e36
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1158928 - merge pull request #30048 from etiennesegonzac:bug-1158928 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/1baf1616ae43
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1158928 - Removing old layer trick and making sure cards always transition their transform r=sfoster

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https://hg.mozilla.org/integration/gaia-central/rev/c4238e7256ec
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1164346 - merge pull request #30039 from EragonJ:bug-1164346 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/dad65751de73
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1164346 - Add a locale id check hook

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "827289ee7f74292a17bfa73a89e43d5a2bcc4e86", 
+        "git_revision": "52edb910451301d2e7ac29a28c486c888e65eb3a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "2b80fa5d4eed0d96845d5ea4d5f9d08637640185", 
+    "revision": "e2c86f978e36308b0ee0dcb55c60bf0620405306", 
     "repo_path": "integration/gaia-central"
 }