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/tools/viewer/sk_app/VulkanWindowContext.cpp b/tools/viewer/sk_app/VulkanWindowContext.cpp
index 4802e21..898710f 100644
--- a/tools/viewer/sk_app/VulkanWindowContext.cpp
+++ b/tools/viewer/sk_app/VulkanWindowContext.cpp
@@ -171,7 +171,7 @@
     // Pick our surface format. For now, just make sure it matches our sRGB request:
     VkFormat surfaceFormat = VK_FORMAT_UNDEFINED;
     VkColorSpaceKHR colorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
-    auto srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named);
+    auto srgbColorSpace = SkColorSpace::MakeSRGB();
     bool wantSRGB = srgbColorSpace == params.fColorSpace;
     for (uint32_t i = 0; i < surfaceFormatCount; ++i) {
         GrPixelConfig config;