Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/89b9081f2a7a
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #32450 from jimporter/music-nga-tiles-titles

Bug 1214869 - [music][nga] Tiles view shouldn't show artist/album nam…

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https://hg.mozilla.org/integration/gaia-central/rev/3c88c460fc2b
Author: Jim <jporter@mozilla.com>
Desc: Bug 1214869 - [music][nga] Tiles view shouldn't show artist/album name if we have real album art

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b855e6944402dca5c850e8f146ef29600ed9802f", 
+        "git_revision": "8869d553b7fa8575c65b3511b9e4cf5067f8ccb8", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "cf5760383773680d2dc071ce5c6f6c91a1b1ffd0", 
+    "revision": "89b9081f2a7a1e7f323dfa38da867316da64f1a6", 
     "repo_path": "integration/gaia-central"
 }