Fix Equals and serialization for rare pngs

src/core/SkColorSpace_Base.h

Index: src/core/SkColorSpace_Base.h
diff --git a/src/core/SkColorSpace_Base.h b/src/core/SkColorSpace_Base.h
index 3a2518db9c176e7e4ea0e68c39a005f625370f1b..38e0ba002682e3deb82b93cdc41effbb7a4d61b6 100644
--- a/src/core/SkColorSpace_Base.h
+++ b/src/core/SkColorSpace_Base.h
@@ -174,7 +174,7 @@ struct SkColorLookUpTable : public SkRefCnt {
 class SkColorSpace_Base : public SkColorSpace {
 public:
 
-    static sk_sp<SkColorSpace> NewRGB(float gammas[3], const SkMatrix44& toXYZD50);
+    static sk_sp<SkColorSpace> NewRGB(const float gammas[3], const SkMatrix44& toXYZD50);
 
     const SkGammas* gammas() const { return fGammas.get(); }