Mark SkSurface::recordingContext() and recorder() as const

Also remove deprecated constants.

Change-Id: I9581b6cbc6671cd59e29b8cd645a044e61fb853b
Bug: skia:13983
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/688037
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Owners-Override: Kevin Lubick <kjlubick@google.com>
8 files changed