Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6c837312e085
Author: Jed Parsons <jedp@me.com>
Desc: Merge pull request #11816 from jedp/903134-mozbrowsererror

Bug 903134 - Clean up Trusted UI on mozbrowsererror; r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/2fd233067990
Author: Jed Parsons <jedp@me.com>
Desc: Bug 903134 - Clean up Trusted UI on mozbrowsererror, mozbrowserclose

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https://hg.mozilla.org/integration/gaia-central/rev/ccee6c59b8c4
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 969413 - Make the edit mode bottom margin rule apply only to the relevant elements r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/7e89291b08ea
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #16107 from yor-mozilla-com/fix969996

Fix for bug 969996 r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/d1393f863c8b
Author: Yan Or <yor@mozilla.com>
Desc: Fix for bug 969996

Delay chunk rendering by grouping chunks into larger
sets before calling renderChunk.  First set size will
be the same as the current FIRST_CHUNK_SIZE (6).  Subsequent
sets will cap at INCREMENTAL_RENDER_SIZE (60).

The goal is to reduce reflows on rendering the call log.

Also fixed the following bugs:
  _groupCounter never gets incremented if there's only one log entry per day
  Change currDate and prevDate comparison to more readable form

Added unit tests for call log rendering of various sizes.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "3376c0645ebdef293ad4190e59c775174252dfe7", 
+    "revision": "6c837312e0857811ec1e7ff9c115b553072cf1b5", 
     "repo_path": "/integration/gaia-central"
 }