Revert "update SkColor4f::FromColor() to preserve transfer function"

This reverts commit 9e229233a67b36a508d3c753a5b93a022369c5f7.

Reason for revert: See if blocking Android roll

Original change's description:
> update SkColor4f::FromColor() to preserve transfer function
> 
> This kills off some sRGB tables,
> and lots of call sites can now use SkColor4f::FromColor().
> 
> It doesn't seem important to keep this test.
> 
> Change-Id: Ia79ec8ace45e80bbc7a1e33f560f59289e61b2fb
> Reviewed-on: https://skia-review.googlesource.com/141046
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=mtklein@chromium.org,brianosman@google.com

Change-Id: I9d76e4ccf8a101853a7404abb33bdab9e0c64c25
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/141181
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
8 files changed