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

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https://hg.mozilla.org/integration/gaia-central/rev/50936cff9847
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22272 from eliperelman/bug-1045076-perf-timestamp-failsafe

Bug 1045076 - Add sanity check to timestamp handlers and return values r=hub

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https://hg.mozilla.org/integration/gaia-central/rev/8ff931be1624
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1045076 - Add sanity check to timestamp handlers and return values

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "7d85710a4dc1529bdcd8870dd759d41040819ef3", 
+    "revision": "50936cff9847cadd18ba0bad8811b3e8f5973cbf", 
     "repo_path": "/integration/gaia-central"
 }