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

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https://hg.mozilla.org/integration/gaia-central/rev/6f74f3416a2a
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #32370 from justindarc/bug1213446

Bug 1213446 - [Music][NGA] Lazy-load tiles in Home view

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https://hg.mozilla.org/integration/gaia-central/rev/ce1a962b1578
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1213446 - [Music][NGA] Lazy-load tiles in Home view

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https://hg.mozilla.org/integration/gaia-central/rev/b833123bf43e
Author: Wes Kocher <kwierso@gmail.com>
Desc: Revert "Merge pull request #32516 from JohanLorenzo/bug-1187330-3" for build failures

This reverts commit 7a67098e9150509468df612261ede16341035294, reversing
changes made to fd3a6621b6de0fac1605b28d3cf12c13c013d366.

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https://hg.mozilla.org/integration/gaia-central/rev/6285be3258b1
Author: Wes Kocher <kwierso@gmail.com>
Desc: Revert "Merge pull request #32495 from stasm/1215454-l20n-3.3.2" for Player_test.js failures in gij(10)

This reverts commit 7cea3fe98b342577ffe348369e5fd540841cd4ce, reversing
changes made to e619ed00be5bc9eea00884e4643ccd14b2c714da.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1d38b58acf720e4a9185ac86dc03098d66e9b000", 
+        "git_revision": "c8ff224ee5a77a7423c23501b336ad1b4a255cbb", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "848543d4e6ff41495cf56cf08e876625f026b855", 
+    "revision": "6f74f3416a2a0b1f3b93e855e410cfda72f370b2", 
     "repo_path": "integration/gaia-central"
 }