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

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https://hg.mozilla.org/integration/gaia-central/rev/627341308031
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #23881 from ian-liu/settings/bug1058419_can_change_default_storage_to_sdcard_while_no_card_in_slot

Bug 1058419 - [Devices][Storage][Flame] SD card is an option for default media location when no SD card inserted, r=ej

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https://hg.mozilla.org/integration/gaia-central/rev/8f2ef15bb7d8
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1058419 - [Devices][Storage][Flame] SD card is an option for default media location when no SD card inserted

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https://hg.mozilla.org/integration/gaia-central/rev/ae74248f585b
Author: Yi-Fan Liao <yliao@mozilla.com>
Desc: Merge pull request #24203 from begeeben/1014605_cannot_add_a_rtsp_shortcut

Bug 1014605 - [Browser][V2.0] Cannot add a RTSP shortcut on homescreen, r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/6fc07bc0ef92
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Bug 1014605 - [Browser][V2.0] Cannot add a RTSP shortcut on homescreen

* Add rtsp url support in the manifest.webapp of the bookmark app.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "28ec60b9e1ebe0af79d2bed3e978ec90dbf1b847", 
+    "revision": "627341308031c17d87b45030c65458647175ad4a", 
     "repo_path": "/integration/gaia-central"
 }