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Building Chrome with /permissive- (a fussy variant in the VC++ compiler)
reports warnings in openvr because exception specifications were removed
from jsoncpp.cpp but not from json.h. The error is:

    jsoncpp.cpp(2599): warning C5043: 'Json::Exception::what':
    exception specification does not match previous declaration

Removing the throw() specifications from json.h restores consistency and
is what was originally intended.

Change-Id: I6146b6299e23f11b35bc1aefd9640541bbbbe953
Reviewed-on: https://chromium-review.googlesource.com/794830Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519949}