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

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https://hg.mozilla.org/integration/gaia-central/rev/1b6352d76e18
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #22807 from 6a68/bug-1038992-fixedup

Bug 1038992 - FxA "forgot password" link crashes refreshAuth flow. r=fer...

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https://hg.mozilla.org/integration/gaia-central/rev/77ce232d3af5
Author: Victor Ng <victor@crankycoder.com>
Desc: Bug 1038992 - FxA "forgot password" link crashes refreshAuth flow. r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/0d17d4530ee7
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #22631 from yzen/bug-1030434

Bug 1030434 - added proper a11y labelling for callscreen's handled call.

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https://hg.mozilla.org/integration/gaia-central/rev/c53e93f34586
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1030434 - added proper a11y labelling for callscreen's handled call.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c3b71e7993bb9ed0f45994f70552601e0466f0e3", 
+    "revision": "1b6352d76e18390380d7d27ad405b86380d5160f", 
     "repo_path": "/integration/gaia-central"
 }