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

========

https://hg.mozilla.org/integration/gaia-central/rev/5bb0222b01cd
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15688 from vingtetun/bug961047

Bug 961047 - Remove some dead code in Gaia with APZC enabled by default ...

========

https://hg.mozilla.org/integration/gaia-central/rev/1e8e6f992756
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 961047 - Remove some dead code in Gaia with APZC enabled by default from the platform. r=alive,fabrice

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "407993cc2cef77f8c8d0415f11996889ed18dc56", 
+    "revision": "5bb0222b01cdeeac465c5dc97b83d99fda76c8e3", 
     "repo_path": "/integration/gaia-central"
 }