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

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https://hg.mozilla.org/integration/gaia-central/rev/8539aa276266
Author: Yi-Fan Liao <yliao@mozilla.com>
Desc: Merge pull request #33684 from ferjm/bug1235330.sync.tv.oom.killed

Bug 1235330 - [TV][Sync] SyncManager does not handle properly the Sync app killed by OOM. r=yifan

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https://hg.mozilla.org/integration/gaia-central/rev/30e6c6b422d3
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Bug 1235330 - [TV][Sync] SyncManager does not handle properly the Sync app killed by OOM. r=yifan

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "63c3a57ad9935b9c61057a29ee27a1c6ed6a9e23", 
+        "git_revision": "6777e7e02df0a6b21d7dd9a5a4c0c996da9ea1c0", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9cfeee1568995b5cf0f58db8924baff387871876", 
+    "revision": "8539aa2762660912abe88d4104e7c760547f9c93", 
     "repo_path": "integration/gaia-central"
 }