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/ColorSpaceXformTest.cpp b/tests/ColorSpaceXformTest.cpp
index bdcdd3e..f8a5c8f 100644
--- a/tests/ColorSpaceXformTest.cpp
+++ b/tests/ColorSpaceXformTest.cpp
@@ -326,8 +326,8 @@
     std::unique_ptr<uint64_t[]> srcPixel(new uint64_t[1]);
     srcPixel[0] = 0;
     uint32_t dstPixel;
-    sk_sp<SkColorSpace> adobe = SkColorSpace::MakeNamed(SkColorSpace::kAdobeRGB_Named);
-    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
+    sk_sp<SkColorSpace> adobe = SkColorSpace_Base::MakeNamed(SkColorSpace_Base::kAdobeRGB_Named);
+    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
     std::unique_ptr<SkColorSpaceXform> xform = SkColorSpaceXform::New(adobe.get(), srgb.get());
 
     // ASAN will catch us if we read past the tail.