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

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https://hg.mozilla.org/integration/gaia-central/rev/389523ab2cb8
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #19613 from eeejay/bug-1015479

Bug 1015479 - Make header markup follow visual order. r=arnau

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https://hg.mozilla.org/integration/gaia-central/rev/0ed2c333bd4c
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1015479 - Make header markup follow visual order.

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https://hg.mozilla.org/integration/gaia-central/rev/9282b03d2d2c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20364 from crdlc/bug-1023011

Bug 1023011 - (vertical-homescreen) Implement pressed state visual for App Icons

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https://hg.mozilla.org/integration/gaia-central/rev/6a00afcf8dba
Author: crdlc <crdlc@tid.es>
Desc: Bug 1023011 - (vertical-homescreen) Implement pressed state visual for App Icons

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ac41749c54044e376451c2a9e35a60c0f221d895", 
+    "revision": "389523ab2cb80046ba124ebc91e089f01e5382a1", 
     "repo_path": "/integration/gaia-central"
 }