Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f200b5abc61f
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #19829 from yzen/bug-1018238

Bug 1018238

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https://hg.mozilla.org/integration/gaia-central/rev/f129ca6b6911
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1018238 - added gaia ui tests for the notification toaster screen reader visibility.

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https://hg.mozilla.org/integration/gaia-central/rev/f3b77ae37421
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1018238 - fixing screen reader visibility around the notification toaster.

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https://hg.mozilla.org/integration/gaia-central/rev/b10567f3c7e9
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #20010 from yzen/bug-1020127

Bug 1020127 - fixing the regression with the full screen app status bar ...

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https://hg.mozilla.org/integration/gaia-central/rev/65cd4409cde7
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1020127 - fixing the regression with the full screen app status bar visibility when it's dragged.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5f6a33cc1d407b252c7d20ca22f39b7d48fc2517", 
+    "revision": "f200b5abc61f9a89c1e8a73e20524314fe8bc74b", 
     "repo_path": "/integration/gaia-central"
 }