Remove a bunch of unused files and functions

Bug: skia:
Change-Id: I1f05014a6ab955f324e4cde4f7b7aebe8f7d72a1
Reviewed-on: https://skia-review.googlesource.com/c/160385
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
6 files changed