Use ::std for is_empty, is_class, add_xxx_reference, remove decay.

include/private/SkUniquePtr.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 SkUniquePtr_DEFINED
 #define SkUniquePtr_DEFINED
 
@@ skipping 30 matching lines @@
         template <typename U> static T* detector(...);
         using type = decltype(detector<remove_reference_t<D>>(0));
     };
 
 public:
     using pointer = typename pointer_type_detector::type;
     using element_type = T;
     using deleter_type = D;
 
 private:
-    template <typename B, bool = is_empty<B>::value /*&& !is_final<B>::value*/>
+    template <typename B, bool = std::is_empty<B>::value /*&& !is_final<B>::value*/>
     struct compressed_base : private B {
         /*constexpr*/ compressed_base() : B() {}
         /*constexpr*/ compressed_base(const B& b) : B(b) {}
         /*constexpr*/ compressed_base(B&& b) : B(std::move(b)) {}
         /*constexpr*/ B& get() /*noexcept*/ { return *this; }
         /*constexpr*/ B const& get() const /*noexcept*/ { return *this; }
         void swap(compressed_base&) /*noexcept*/ { }
     };
 
     template <typename B> struct compressed_base<B, false> {
@@ skipping 152 matching lines @@
         template <typename U> static T* detector(...);
         using type = decltype(detector<remove_reference_t<D>>(0));
     };
 
 public:
     using pointer = typename pointer_type_detector::type;
     using element_type = T;
     using deleter_type = D;
 
 private:
-    template <typename B, bool = is_empty<B>::value /*&& !is_final<B>::value*/>
+    template <typename B, bool = std::is_empty<B>::value /*&& !is_final<B>::value*/>
     struct compressed_base : private B {
         /*constexpr*/ compressed_base() : B() {}
         /*constexpr*/ compressed_base(const B& b) : B(b) {}
         /*constexpr*/ compressed_base(B&& b) : B(std::move(b)) {}
         /*constexpr*/ B& get() /*noexcept*/ { return *this; }
         /*constexpr*/ B const& get() const /*noexcept*/ { return *this; }
         void swap(compressed_base&) /*noexcept*/ { }
     };
 
     template <typename B> struct compressed_base<B, false> {
@@ skipping 157 matching lines @@
 
 template <typename T, typename D>
 inline bool operator!=(std::nullptr_t, const unique_ptr<T, D>& b) /*noexcept*/ {
     //return (bool)b;
     return b.is_attached();
 }
 
 }  // namespace skstd
 
 #endif