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

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https://hg.mozilla.org/integration/gaia-central/rev/d1a239ae4b04
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #28446 from cctuan/1136535

Bug 1136535 - webapp object should be JSON.stringifiedable

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https://hg.mozilla.org/integration/gaia-central/rev/e15a8a7d0526
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1136535 - webapp object should be JSON.stringifiedable

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https://hg.mozilla.org/integration/gaia-central/rev/9b2f0e18082b
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #28459 from stasm/1136368-buildtime-qps-names

Bug 1136368 - Mark pseudolocale as runtime or buildtime in language selection list. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/0470a0b0ebbf
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1136368 - Mark pseudolocale as runtime or buildtime in language selection list

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "5c7442a89b9ce4b6c23b6b05df0d50d20f8031dd", 
+        "git_revision": "16e0aca16667d94ed9fed5ae7eed3a14da0d7986", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "88fb6482a5f48f76241d5f37f5555431679c7fdd", 
+    "revision": "d1a239ae4b04919a0782c0840eb78720dc139a7c", 
     "repo_path": "integration/gaia-central"
 }