Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f5df20744bba
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1092362 - Use the default audio channel when playing audible tones outside of calls r=drs,francisco

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https://hg.mozilla.org/integration/gaia-central/rev/5fb00829c724
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #26288 from azasypkin/bug-1100954-set-header-content

Bug 1100954 - Activities menu has no text after forwarding a SMS. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/86ea5190c23d
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1100954 - Activities menu has no text after forwarding a SMS. r=julien

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9d453249697f99f43e561928c641ded054160015", 
+    "revision": "f5df20744bba6d42c038310067cf860119ebafb8", 
     "repo_path": "integration/gaia-central"
 }