Remove tracking of SkDestinationSurfaceColorMode on GrTextureProxy for mips

When we create a new surface from a proxy we were always using legacy and
when we wrapped an existing surface we never actaully had to use the value
we pulled off of it since the proxy was already instantiatied.

Bug: skia:
Change-Id: Ifcb5f3ac2f1dcf41b01a98c554d682ae57028d5a
Reviewed-on: https://skia-review.googlesource.com/106207
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
6 files changed