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

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https://hg.mozilla.org/integration/gaia-central/rev/87410a6c959a
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13656 from crdlc/bug-938043

Bug 938043 - [Download Manager] Refine the shared component DownloadUI

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https://hg.mozilla.org/integration/gaia-central/rev/0184baca2ac9
Author: crdlc <crdlc@tid.es>
Desc: Bug 938043 - [Download Manager] Refine the shared component DownloadUI

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "cc19eb825976c46e815e76b48a519ea8f379470d", 
+    "revision": "87410a6c959ae76cf29200aaa81d5d168b9fd019", 
     "repo_path": "/integration/gaia-central"
 }