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

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https://hg.mozilla.org/integration/gaia-central/rev/e4a068c1ec04
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #22772 from luke-chang/1050682_sms_wrong_multiline_style

Bug 1050682 - [Messages] The recipient container will remain multiline style when removing the last recipient from opened panel, r=steveck-chung

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https://hg.mozilla.org/integration/gaia-central/rev/4c487cca6baf
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1050682 - [Messages] The recipient container will remain multiline style when removing the last recipient from opened panel

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https://hg.mozilla.org/integration/gaia-central/rev/6b71ee9997c5
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #22843 from julienw/1046828-fix-marionette-tests

Bug 1046828 - [Notifications API] We should never send the "show" event ...

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https://hg.mozilla.org/integration/gaia-central/rev/681fd8fa0f10
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1046828 - [Notifications API] We should never send the "show" event using system messages at a reboot r=mhenretty

Fix marionette tests

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2fb6119da922ebdab70c79e7f515f49fa582b2c5", 
+    "revision": "e4a068c1ec044595738a3698fa32840764dd7ca0", 
     "repo_path": "/integration/gaia-central"
 }