Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/439743f0ec9e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20746 from julienw/1027586-ignore-leaks-task-manager-test

Bug 1027586 - [System] ignore leaks in system tests r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/30ec902a640c
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1027586 - [System] ignore leaks in system tests r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2706085fd172
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20675 from julienw/1016429-fix-settings-test-newer-mocha

Bug 1016429 - [Settings] Fix unit tests with a newer mocha r=cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/10c03cc878ce
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1016429 - [Settings] Fix unit tests with a newer mocha r=cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/ba44b837fd59
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #20487 from mnjul/bug_1023329_lockscreen_color_overlay_only_for_wallpaper_picker

Bug 1023329 - [VsD Refresh] Lockscreen Visual Refresh > Color overlay with notifications wrong with wallpapers chosen from gallery and camera

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https://hg.mozilla.org/integration/gaia-central/rev/482ed463aa20
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1023329 - [VsD Refresh] Lockscreen Visual Refresh > Color overlay with notifications wrong with wallpapers chosen from gallery and camera

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "562a515a6a1c059e70a20517c755d9053e68a1c6", 
+    "revision": "439743f0ec9e7735c62d7811cf8e676aa71ee6e6", 
     "repo_path": "/integration/gaia-central"
 }