SkColorSpace: remove named API, add gamut API

Reland from: https://skia-review.googlesource.com/c/8021/

BUG=skia:

Change-Id: I18985f130587b15fccbc86b76b2bb5c49ba5ba8a
Reviewed-on: https://skia-review.googlesource.com/8136
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index 2097ab3..dd71943 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -807,8 +807,8 @@
     bool f16Support,
     std::function<sk_sp<SkSurface>(const SkImageInfo&)> surfaceMaker) {
 
-    auto srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
-    auto adobeColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kAdobeRGB_Named);
+    auto srgbColorSpace = SkColorSpace::MakeSRGB();
+    auto adobeColorSpace = SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kAdobeRGB_Named);
     const SkMatrix44* srgbMatrix = as_CSB(srgbColorSpace)->toXYZD50();
     SkASSERT(srgbMatrix);
     SkColorSpaceTransferFn oddGamma;
@@ -816,7 +816,7 @@
     oddGamma.fB = oddGamma.fC = oddGamma.fD = oddGamma.fE = oddGamma.fF = 0.0f;
     oddGamma.fG = 4.0f;
     auto oddColorSpace = SkColorSpace::MakeRGB(oddGamma, *srgbMatrix);
-    auto linearColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGBLinear_Named);
+    auto linearColorSpace = SkColorSpace::MakeSRGBLinear();
 
     const struct {
         SkColorType         fColorType;