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

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https://hg.mozilla.org/integration/gaia-central/rev/a4f1842f7bd5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15334 from KevinGrandon/bug_959867_task_manager_focus

Bug 959867 - [Rocketbar] Input should be focused if empty task manager r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/370df8e6f537
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 959867 - [Rocketbar] Input should be focused if empty task manager r=alive

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2b4977c69cb408907220eb7545e61c70fee53624", 
+    "revision": "a4f1842f7bd53360b3f92db1b3a44f6b8f8f589c", 
     "repo_path": "/integration/gaia-central"
 }