Remove GrTraceMarker and friends

This has been disabled for almost two years.

Bug: skia:
Change-Id: Idc1dbf2220514947d2ccd91968e6e173d44d1b86
Reviewed-on: https://skia-review.googlesource.com/27740
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed