Add comment about usages of JsonCpp in chromium code

Bug: 1223528
Change-Id: Iaedb52a5350175c1545362e4d8e8dcdb54d83fca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2986082
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#895835}
NOKEYCHECK=True
GitOrigin-RevId: 2a54c56644a19cd60ec0cab490021e8d0fff6d3c
1 file changed