Use a smart pointer for SkColorSpace factories

src/core/SkColorSpace.h

Index: src/core/SkColorSpace.h
diff --git a/src/core/SkColorSpace.h b/src/core/SkColorSpace.h
index ec6ab43c3cdd28d3865f2162bb9d84483241f72f..777be9da2b4ebaae9e918197517775adb2a82777 100644
--- a/src/core/SkColorSpace.h
+++ b/src/core/SkColorSpace.h
@@ -50,10 +50,10 @@ public:
      *  Return a colorspace instance, given a 3x3 transform from linear_RGB to D50_XYZ
      *  and the src-gamma, return a ColorSpace
      */
-    static SkColorSpace* NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma);
+    static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma);
 
-    static SkColorSpace* NewNamed(Named);
-    static SkColorSpace* NewICC(const void*, size_t);
+    static sk_sp<SkColorSpace> NewNamed(Named);
+    static sk_sp<SkColorSpace> NewICC(const void*, size_t);
 
     SkFloat3 gamma() const { return fGamma; }
     SkFloat3x3 xyz() const { return fToXYZD50; }