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

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https://hg.mozilla.org/integration/gaia-central/rev/e0816d2581cd
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1131344 - merge pull request #28147 from Cwiiis:bug1131344-redundant-top-hint to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/6bf678ca60fc
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1131344 - Fix redundant hover-over-top indicator. r=kgrandon

Stop showing indications for inserting a group at the top of the container
if the result is redundant.

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https://hg.mozilla.org/integration/gaia-central/rev/6184bdbbb57c
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #27580 from jobara/1102506

Bug 1102506 - labelling buttons with aria

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https://hg.mozilla.org/integration/gaia-central/rev/874a6cacf0da
Author: Justin Obara <obara.justin@gmail.com>
Desc: Bug 1102506 - labelling buttons with aria

Rather than having the text as invisible text nodes. The labels for the sync and settings buttons in the calendar settings are now set using an aria-label.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b0f799a5de174ce11b5958748daf815313022632", 
+        "git_revision": "4f39e48b95fa00c8669b8707447542024bb55432", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "aac354b941470a9626cb10f4f79e69d5da4bcbb3", 
+    "revision": "e0816d2581cdc2d0581f625c06811128c87c0c48", 
     "repo_path": "integration/gaia-central"
 }