Move SkJSONCPP.h to tools.  It tool-only.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2184483003
CQ_INCLUDE_TRYBOTS=master.client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

TBR=reed@google.com

Review-Url: https://codereview.chromium.org/2184483003
2 files changed