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This patch rolls JsonCpp to HEAD.

Bug: 989851
Change-Id: I062f7d398190b61a66d48952b7504848ab1d75ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2433107Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810999}