remove experimental treat-skcolor-as-srgb flag

src/core/SkColor.cpp

Index: src/core/SkColor.cpp
diff --git a/src/core/SkColor.cpp b/src/core/SkColor.cpp
index 985790dfe50bbca2464eeb3ad8ff040f3c37d909..134de7ad8f73ab079a8fbbeb95fc1cc04b7e3a99 100644
--- a/src/core/SkColor.cpp
+++ b/src/core/SkColor.cpp
@@ -9,8 +9,6 @@
 #include "SkColorPriv.h"
 #include "SkFixed.h"
 
-bool gTreatSkColorAsSRGB;
-
 SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
     return SkPremultiplyARGBInline(a, r, g, b);
 }
@@ -158,11 +156,9 @@ SkColor4f SkColor4f::FromColor(SkColor c) {
     Sk4f value = SkNx_shuffle<2,1,0,3>(SkNx_cast<float>(Sk4b::Load(&c)));
     SkColor4f c4;
     (value * Sk4f(1.0f / 255)).store(&c4);
-    if (gTreatSkColorAsSRGB) {
-        c4.fR = srgb_to_linear(c4.fR);
-        c4.fG = srgb_to_linear(c4.fG);
-        c4.fB = srgb_to_linear(c4.fB);
-    }
+    c4.fR = srgb_to_linear(c4.fR);
+    c4.fG = srgb_to_linear(c4.fG);
+    c4.fB = srgb_to_linear(c4.fB);
     return c4;
 }