Remove now-unnecessary VectorTraits specializations.

Source/wtf/VectorTraits.h

Index: Source/wtf/VectorTraits.h
diff --git a/Source/wtf/VectorTraits.h b/Source/wtf/VectorTraits.h
index 2b6544ce35239b8d755ebc3a534c09f5d994d73e..4a6209e0805e65dbd9a4487e5881b137269fdbfa 100644
--- a/Source/wtf/VectorTraits.h
+++ b/Source/wtf/VectorTraits.h
@@ -24,6 +24,7 @@
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/TypeTraits.h"
+#include <type_traits>
 #include <utility>
 
 using std::pair;
@@ -35,12 +36,12 @@ namespace WTF {
     template<typename T>
     struct VectorTraitsBase
     {
-        static const bool needsDestruction = !IsPod<T>::value;
-        static const bool canInitializeWithMemset = IsPod<T>::value;
-        static const bool canMoveWithMemcpy = IsPod<T>::value;
-        static const bool canCopyWithMemcpy = IsPod<T>::value;
-        static const bool canFillWithMemset = IsPod<T>::value && (sizeof(T) == sizeof(char));
-        static const bool canCompareWithMemcmp = IsPod<T>::value;
+        static const bool needsDestruction = !std::is_trivially_destructible<T>::value;
+        static const bool canInitializeWithMemset = std::is_pod<T>::value;
+        static const bool canMoveWithMemcpy = std::is_pod<T>::value;
+        static const bool canCopyWithMemcpy = std::is_pod<T>::value;
+        static const bool canFillWithMemset = std::is_pod<T>::value && (sizeof(T) == sizeof(char));
+        static const bool canCompareWithMemcmp = std::is_pod<T>::value;
         template<typename U = void>
         struct NeedsTracingLazily {
             static const bool value = NeedsTracing<T>::value;