Use a smart pointer for SkColorSpace factories

src/core/SkColorSpace.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorSpace_DEFINED
 #define SkColorSpace_DEFINED
 
@@ skipping 32 matching lines @@
     enum Named {
         kUnknown_Named,
         kDevice_Named,
         kSRGB_Named,
     };
 
     /**
      *  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; }
     Named named() const { return fNamed; }
     uint32_t uniqueID() const { return fUniqueID; }
 
     enum Result {
         kFailure_Result,
         kIdentity_Result,
         kNormal_Result,
@@ skipping 12 matching lines @@
     SkColorSpace(const SkFloat3x3& toXYZ, const SkFloat3& gamma, Named);
 
 private:
     const SkFloat3x3 fToXYZD50;
     const SkFloat3   fGamma;
     const uint32_t   fUniqueID;
     const Named      fNamed;
 };
 
 #endif