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

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https://hg.mozilla.org/integration/gaia-central/rev/391abd124dba
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #34148 from weilonge/seanlee/TVSettings/master/Bug1254815

Bug 1254815 - Add Nexus Remote (BT HID) devices support in Settings app. r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/8bef90d29171
Author: Sean Lee <weilonge@gmail.com>
Desc: Bug 1254815 - Add Nexus Remote (BT HID) devices support in Settings app.

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https://hg.mozilla.org/integration/gaia-central/rev/0208e4819d3e
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #34160 from weilonge/seanlee/DataSync/master/Bug1256227

Bug 1256227 - Add last_modified property into Tabs sync record. r=michielbdejong

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https://hg.mozilla.org/integration/gaia-central/rev/90c665d78c68
Author: Sean Lee <weilonge@gmail.com>
Desc: Bug 1256227 - Add last_modified property into Tabs sync record.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "19d23ce1bfb38eb6156d65fb550e98229b8b5072", 
+        "git_revision": "1ba69e842654f4f4cb54f96853fe5017c98d6944", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "fc1da648015f9582627c8655006156656ddd5667", 
+    "revision": "391abd124dbac9920eaf7ba16c0b81e8184cab59", 
     "repo_path": "integration/gaia-central"
 }