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

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https://hg.mozilla.org/integration/gaia-central/rev/663b5ce9bb9e
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #26478 from gasolin/issue-1102885

Bug 1089511 refactor system/js/bluetooth to future compatible format, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/ed50a13c0655
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1089511 - refactor system/js/bluetooth to future compatible format
- fix store bluetooth state when restart

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "719add3a015541784c0041455d228c71a064576f", 
+    "revision": "663b5ce9bb9ec58737e115e6b28943624de6f01d", 
     "repo_path": "integration/gaia-central"
 }