Move toXYZD50() to SkColorSpace_Base

tests/SurfaceTest.cpp

Index: tests/SurfaceTest.cpp
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index 6706fef7e4e1051d8b2f7ec5fe83496385f6bdec..224e8c74cfc3ce1a03818b581799536db5ad2ead 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -921,7 +921,7 @@ static void test_surface_creation_and_snapshot_with_color_space(
 
     auto srgbColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
     auto adobeColorSpace = SkColorSpace::NewNamed(SkColorSpace::kAdobeRGB_Named);
-    SkMatrix44 srgbMatrix = srgbColorSpace->toXYZD50();
+    SkMatrix44 srgbMatrix = as_CSB(srgbColorSpace)->toXYZD50();
     const float oddGamma[] = { 2.4f, 2.4f, 2.4f };
     auto oddColorSpace = SkColorSpace_Base::NewRGB(oddGamma, srgbMatrix);
     auto linearColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGBLinear_Named);