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

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https://hg.mozilla.org/integration/gaia-central/rev/fdd3f193fc2e
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1137715 - merge pull request #28684 from gmarty:Bug-1137715-RTL-browser-search-bar to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/ddfbdc0ec17d
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1137715 - [Browser][RTL] The URL bar should always be in LTR

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https://hg.mozilla.org/integration/gaia-central/rev/e373ac6dd341
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1139406 - merge pull request #28667 from mwargers:test_keyboard_predictive_key.py to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/dba59b067a99
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1139406 - Make test_keyboard_predictive_key.py pass on b2g desktop

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "83a88c1cab569c5503aad3f4cf09236d91a268a3", 
+        "git_revision": "20f19c593bdb8413c62234bb7e84499137284bd7", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "95125d3f351def1e2ce0f10409c81935eadf62c8", 
+    "revision": "fdd3f193fc2e1ea1e96c3faed777a397f6cd2046", 
     "repo_path": "integration/gaia-central"
 }