Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a9ce3f2baa91
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22207 from svic/Bug_1043856

Bug 1043856 - Increase handover timeout

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https://hg.mozilla.org/integration/gaia-central/rev/bb1a7373c083
Author: Arno Puder <arno@puder.org>
Desc: Bug 1043856 - Increase handover timeout

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https://hg.mozilla.org/integration/gaia-central/rev/a3be175221d3
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22305 from wilsonpage/1045214

Bug 1045214 - [B2G][Gallery]Launching camera from gallery results in blank

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https://hg.mozilla.org/integration/gaia-central/rev/eead19ff9fa7
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1045214 - [B2G][Gallery]Launching camera from gallery results in blank viewfinder

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8b31befd858b54e340fc78acece556845c14b41d", 
+    "revision": "a9ce3f2baa91e9f9bb7449281561fec7bb1986dd", 
     "repo_path": "/integration/gaia-central"
 }