Remove all references to jsoncpp (build scripts, DEPS, etc) Bug: skia: Change-Id: I3cec245e537eee3e6ceb0a4a52bad733c2c8746e Reviewed-on: https://skia-review.googlesource.com/c/189842 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Florin Malita <fmalita@chromium.org>