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

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https://hg.mozilla.org/integration/gaia-central/rev/8c92a6bdf044
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #33756 from justindarc/bug1236992

Bug 1236992 - [Music] Fix issues with rAF and <iframe> from Bug 1190093

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https://hg.mozilla.org/integration/gaia-central/rev/3428571efa90
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1236992 - [Music] Fix issues with rAF and <iframe> from Bug 1190093

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https://hg.mozilla.org/integration/gaia-central/rev/2054fb114b78
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #33781 from hfiguiere/bug1236726-enumerate-check

Bug 1236726 - Fix waitForListEnumerate() to properly wait. r=justindarc

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https://hg.mozilla.org/integration/gaia-central/rev/a8e514cb5629
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1236726 - Fix waitForListEnumerate() to properly wait.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "62900f1e42d596c3faa2787a8bd18a8be034b558", 
+        "git_revision": "7d591bdd3b72e0f6cfb6e950e0713c2eb2eb8d15", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "e51159a1a86de1eb0e0dc2a3b84dfd03e8be8b8b", 
+    "revision": "8c92a6bdf0445efec7066814191e9e5104bf3f64", 
     "repo_path": "integration/gaia-central"
 }