Revert of Unconditionally include <string> and <iostream> in json_reader.cpp (https://codereview.chromium.org/291803003/)

Reason for revert:
This adds a static initializer.

Original issue's description:
> Unconditionally include <string> and <iostream> in json_reader.cpp
> Non-PNaCl builds that use libc++ also require these headers.
> 
> BUG=None
> R=mallinath@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271429

TBR=mallinath@chromium.org,ronghuawu@chromium.org,glider@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/290923003

git-svn-id: http://src.chromium.org/svn/trunk/src/third_party/jsoncpp@271446 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed