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

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https://hg.mozilla.org/integration/gaia-central/rev/781a4d935f32
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #14397 from vingtetun/bug938312

Bug 938312 - Wrong orientation when starting browser in landscape mode. ...

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https://hg.mozilla.org/integration/gaia-central/rev/c92773dd9adb
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 938312 - Wrong orientation when starting browser in landscape mode. r=alive

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a201e09de7acc50b9be2c2d75e494f8b6ecda594", 
+    "revision": "781a4d935f321508b47c33125ab80221c40d252f", 
     "repo_path": "/integration/gaia-central"
 }