Revert "SkColorSpaceXformer: Preserve local matrix on shaders"

Revert "SkColorSpaceXformer: Preserve local matrix on shaders"

This reverts commit 5d884b562828ceb13ccacb71bc4581d2020e62bb.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> SkColorSpaceXformer: Preserve local matrix on shaders
>
> Also, do not drop unknown shaders.
>
> Fixes cts tests.
>
> b/37161109
> b/37237678
>
> Bug: skia:
> Change-Id: I0fd817a4d6461ede0ccdcb8f3cccb255b646b864
> Reviewed-on: https://skia-review.googlesource.com/13246
> Commit-Queue: Matt Sarett <msarett@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
>

TBR=mtklein@chromium.org,mtklein@google.com,msarett@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I34e02785ac43a04f8452c458680ea1d6518818a6
Reviewed-on: https://skia-review.googlesource.com/13258
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>