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

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https://hg.mozilla.org/integration/gaia-central/rev/3e924f3b2ffe
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #14610 from crdlc/bug-948934

Bug 948934 - [Download Manager] The downloading icon is not displayed du...

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https://hg.mozilla.org/integration/gaia-central/rev/285ad848f079
Author: crdlc <crdlc@tid.es>
Desc: Bug 948934 - [Download Manager] The downloading icon is not displayed during the download

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0445fcd57874f607dbba2395195c9b595aaf8a8a", 
+    "revision": "3e924f3b2ffee0c39a2bc1566508f003f6e7244d", 
     "repo_path": "/integration/gaia-central"
 }