Removed makeLinearGamma() from the public API for SkColorSpace

src/core/SkColorSpace.cpp

Index: src/core/SkColorSpace.cpp
diff --git a/src/core/SkColorSpace.cpp b/src/core/SkColorSpace.cpp
index 6c4b474b7696b6cc8a2710246c9cbf3494b12d7d..405285636ba4086368a74165b252dc0db68a8e45 100644
--- a/src/core/SkColorSpace.cpp
+++ b/src/core/SkColorSpace.cpp
@@ -287,7 +287,7 @@ sk_sp<SkColorSpace> SkColorSpace::NewNamed(Named named) {
     return nullptr;
 }
 
-sk_sp<SkColorSpace> SkColorSpace::makeLinearGamma() {
+sk_sp<SkColorSpace> SkColorSpace_Base::makeLinearGamma() {
     if (this->gammaIsLinear()) {
         return sk_ref_sp(this);
     }