Port uses of SkLazyPtr to SkOncePtr.

include/private/SkOncePtr.h

Index: include/private/SkOncePtr.h
diff --git a/include/private/SkOncePtr.h b/include/private/SkOncePtr.h
index 9af204bcb29381d97f8444165d10267ce79a460b..0904d4595e4f7595c301a21f2e90cb4ed7f02793 100644
--- a/include/private/SkOncePtr.h
+++ b/include/private/SkOncePtr.h
@@ -9,6 +9,7 @@
 #define SkOncePtr_DEFINED
 
 #include "SkAtomics.h"
+#include "SkUniquePtr.h"
 
 template <typename T> class SkStaticOnce;
 
@@ -16,15 +17,15 @@ template <typename T> class SkStaticOnce;
 #define SK_DECLARE_STATIC_ONCE_PTR(type, name) namespace {} static SkStaticOnce<type> name
 
 // Use this for a local or member pointer that's initialized exactly once when you call get().
-template <typename T>
+template <typename T, typename Delete = skstd::default_delete<T>>
 class SkOncePtr : SkNoncopyable {
 public:
     SkOncePtr() { sk_bzero(this, sizeof(*this)); }
-
-    // SkOncePtr does not have a destructor and does not clean up the pointer.  But you may, e.g.
-    //   delete (T*)fOncePtr;
-    //   SkSafeUnref((T*)fOncePtr);
-    // etc.
+    ~SkOncePtr() {
+        if (T* ptr = (T*)*this) {
+            Delete()(ptr);
+        }
+    }
 
     template <typename F>
     T* get(const F& f) const {