Remove unused SkPictureContentInfo

Change-Id: I398151efcd87b26345499f688403cf0a41d15e59
Reviewed-on: https://skia-review.googlesource.com/99783
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
7 files changed