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/bench/ColorCodecBench.cpp b/bench/ColorCodecBench.cpp
index 06afdc6..867b8a1 100644
--- a/bench/ColorCodecBench.cpp
+++ b/bench/ColorCodecBench.cpp
@@ -67,7 +67,7 @@
 
     fDstSpace = nullptr;
     if (FLAGS_srgb) {
-        fDstSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
+        fDstSpace = SkColorSpace::MakeSRGB();
     } else if (FLAGS_nonstd) {
         SkColorSpaceTransferFn gamma;
         gamma.fA = 1.0f;
diff --git a/bench/GrMipMapBench.cpp b/bench/GrMipMapBench.cpp
index 56b66ce..2037495 100644
--- a/bench/GrMipMapBench.cpp
+++ b/bench/GrMipMapBench.cpp
@@ -36,7 +36,7 @@
             if (nullptr == context) {
                 return;
             }
-            auto srgb = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
+            auto srgb = SkColorSpace::MakeSRGB();
             SkImageInfo info = SkImageInfo::Make(fW, fH, kN32_SkColorType, kPremul_SkAlphaType,
                                                  srgb);
             fSurface = SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info);
diff --git a/bench/SkLinearBitmapPipelineBench.cpp b/bench/SkLinearBitmapPipelineBench.cpp
index 4e892b6..a0ed605 100644
--- a/bench/SkLinearBitmapPipelineBench.cpp
+++ b/bench/SkLinearBitmapPipelineBench.cpp
@@ -91,7 +91,7 @@
         sk_ignore_unused_variable(trash);
 
         fInfo = SkImageInfo::MakeN32Premul(width, height, fIsSRGB ?
-                                      SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named) : nullptr);
+                                      SkColorSpace::MakeSRGB() : nullptr);
     }
 
     bool isSuitableFor(Backend backend) override {
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 0f1e482..92475d3 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -456,10 +456,10 @@
                    kN32_SkColorType, kPremul_SkAlphaType, nullptr)
         CPU_CONFIG(565,  kRaster_Backend,
                    kRGB_565_SkColorType, kOpaque_SkAlphaType, nullptr)
-        auto srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
+        auto srgbColorSpace = SkColorSpace::MakeSRGB();
         CPU_CONFIG(srgb, kRaster_Backend,
                    kN32_SkColorType,  kPremul_SkAlphaType, srgbColorSpace)
-        auto srgbLinearColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGBLinear_Named);
+        auto srgbLinearColorSpace = SkColorSpace::MakeSRGBLinear();
         CPU_CONFIG(f16,  kRaster_Backend,
                    kRGBA_F16_SkColorType, kPremul_SkAlphaType, srgbLinearColorSpace)
     }