Remove old ICC parser, A2B SkColorSpace, SkGammas, etc...

Docs-Preview: https://skia.org/?cl=148807
Change-Id: I2d77f6543e390c4948d57242a518af77443f0165
Reviewed-on: https://skia-review.googlesource.com/148807
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
12 files changed