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

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https://hg.mozilla.org/integration/gaia-central/rev/db62654b38b1
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15428 from bobsilverberg/kb_change_lang

Bug 960698 - Un-xfail test_settings_change_keyboard_language

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https://hg.mozilla.org/integration/gaia-central/rev/6c5537b60e11
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 960698 - Un-xfail test_settings_change_keyboard_language

Unxfailing the test as https://bugzilla.mozilla.org/show_bug.cgi?id=956761 seems to be fixed

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https://hg.mozilla.org/integration/gaia-central/rev/1af7b58e08e2
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15416 from brunovilar/master

Bug 943812 - Remove "R$" from English keyboard layout, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/39d7deffc3d5
Author: Bruno Vilar <brunovilar@gmail.com>
Desc: Bug 943812 - Remove "R$" from English keyboard layout.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "18bd82325a82f5b9a3a4b976e213515cd3e5866b", 
+    "revision": "db62654b38b1b3ad67410da219c9c53cf25a4768", 
     "repo_path": "/integration/gaia-central"
 }