Revert "Reland "Add SkColorSpaceXform_skcms""

This reverts commit 57337d90a56f458451a01944efcdc205473bc0bb.

Reason for revert: More investigation needed...

Original change's description:
> Reland "Add SkColorSpaceXform_skcms"
> 
> This reverts commit 8103ecae7b535f011f89b03545fe768801027b6b.
> 
> Reason for revert: Investigated the 565 diffs, they appear to be *more* correct.
> 
> Original change's description:
> > Revert "Add SkColorSpaceXform_skcms"
> > 
> > This reverts commit 67f62b1a61016ad07b44ae5a0bbf79d97adc9ba9.
> > 
> > Reason for revert: I want to investigate the image/colorimage gold diffs. May be correct, but some of them are pretty large.
> > 
> > Original change's description:
> > > Add SkColorSpaceXform_skcms
> > > 
> > > Currently only enabled in Skia dev builds. Passes all unit
> > > tests. Has some GM differences, but nothing major.
> > > 
> > > Bug: skia:
> > > Change-Id: Ib87f8cff44649c731e829f063ccef448d67d1910
> > > Reviewed-on: https://skia-review.googlesource.com/112520
> > > Commit-Queue: Brian Osman <brianosman@google.com>
> > > Reviewed-by: Mike Klein <mtklein@google.com>
> > 
> > TBR=mtklein@google.com,brianosman@google.com,reed@google.com
> > 
> > Change-Id: Ib4d7174f5c2700d6f742f488e740e5a6c87ac7a8
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: skia:
> > Reviewed-on: https://skia-review.googlesource.com/113880
> > Reviewed-by: Brian Osman <brianosman@google.com>
> > Commit-Queue: Brian Osman <brianosman@google.com>
> 
> TBR=mtklein@google.com,brianosman@google.com,reed@google.com
> 
> Change-Id: I6501ff55349a6aeed62bb64afc47f789e8cc3460
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:
> Reviewed-on: https://skia-review.googlesource.com/114040
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=mtklein@google.com,brianosman@google.com,reed@google.com

Change-Id: Ic9ee46032762a8b5fc96314c460ce01708673472
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/114100
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index d88048c..0fd1251 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -726,12 +726,11 @@
 optional("skcms") {
   enabled = skia_use_skcms
 
-  public_defines = [ "SK_USE_SKCMS" ]
   deps = [
     "//third_party/skcms",
   ]
   sources = [
-    "src/core/SkColorSpaceXform_skcms.cpp",
+    # TODO
   ]
 }