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

src/core/SkRecord.h

Index: src/core/SkRecord.h
diff --git a/src/core/SkRecord.h b/src/core/SkRecord.h
index 8901d62e9193a4e136eb62d24b451491f2244377..866d1837ad57ed4852c3ef4e117690e2be59e8ff 100644
--- a/src/core/SkRecord.h
+++ b/src/core/SkRecord.h
@@ -138,13 +138,13 @@ private:
     };
 
     template <typename T>
-    SK_WHEN(skstd::is_empty<T>::value, T*) allocCommand() {
+    SK_WHEN(std::is_empty<T>::value, T*) allocCommand() {
         static T singleton = {};
         return &singleton;
     }
 
     template <typename T>
-    SK_WHEN(!skstd::is_empty<T>::value, T*) allocCommand() { return this->alloc<T>(); }
+    SK_WHEN(!std::is_empty<T>::value, T*) allocCommand() { return this->alloc<T>(); }
 
     void grow();