Revert of skstd -> std for unique_ptr

include/private/SkOncePtr.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkOncePtr_DEFINED
 #define SkOncePtr_DEFINED
 
 #include "../private/SkAtomics.h"
-#include <memory>
+#include "SkUniquePtr.h"
 
 template <typename T> class SkBaseOncePtr;
 
 // Use this to create a global static pointer that's intialized exactly once when you call get().
 #define SK_DECLARE_STATIC_ONCE_PTR(type, name) namespace {} static SkBaseOncePtr<type> name;
 
 // Use this for a local or member pointer that's initialized exactly once when you call get().
-template <typename T, typename Delete = std::default_delete<T>>
+template <typename T, typename Delete = skstd::default_delete<T>>
 class SkOncePtr : SkNoncopyable {
 public:
     SkOncePtr() { sk_bzero(this, sizeof(*this)); }
     ~SkOncePtr() {
         if (T* ptr = (T*)*this) {
             Delete()(ptr);
         }
     }
 
     template <typename F>
     T* get(const F& f) const {
         return fOnce.get(f);
     }
 
     operator T*() const {
         return (T*)fOnce;
     }
 
 private:
     SkBaseOncePtr<T> fOnce;
 };
 
 // If you ask for SkOncePtr<T[]>, we'll clean up with delete[] by default.
 template <typename T>
-class SkOncePtr<T[]> : public SkOncePtr<T, std::default_delete<T[]>> {};
+class SkOncePtr<T[]> : public SkOncePtr<T, skstd::default_delete<T[]>> {};
 
 /* TODO(mtklein): in next CL
 typedef SkBaseOncePtr<void> SkOnceFlag;
 #define SK_DECLARE_STATIC_ONCE(name) namespace {} static SkOnceFlag name
 
 template <typename F>
 inline void SkOnce(SkOnceFlag* once, const F& f) {
     once->get([&]{ f(); return (void*)2; });
 }
 */
@@ skipping 41 matching lines @@
         // TODO: If state == 1 spin until it's not?
     }
 
     // fState == 0 --> we have not created our ptr yet
     // fState == 1 --> someone is in the middle of creating our ptr
     // else        --> (T*)fState is our ptr
     mutable uintptr_t fState;
 };
 
 #endif//SkOncePtr_DEFINED