Removed makeLinearGamma() from the public API for SkColorSpace

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 0ce3738e327aab5c8346b7f629ae8955d48d3ff5..f9c831a9a87f6c69b7c5e711e50369a5331096e6 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -846,11 +846,12 @@ static Sink* create_sink(const SkCommandLineConfig* config) {
 
     if (FLAGS_cpu) {
         auto srgbColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
+        auto srgbLinearColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGBLinear_Named);
 
         SINK("565",  RasterSink, kRGB_565_SkColorType);
         SINK("8888", RasterSink, kN32_SkColorType);
         SINK("srgb", RasterSink, kN32_SkColorType, srgbColorSpace);
-        SINK("f16",  RasterSink, kRGBA_F16_SkColorType, srgbColorSpace->makeLinearGamma());
+        SINK("f16",  RasterSink, kRGBA_F16_SkColorType, srgbLinearColorSpace);
         SINK("pdf",  PDFSink);
         SINK("skp",  SKPSink);
         SINK("pipe", PipeSink);