Remove now-unnecessary VectorTraits specializations.

Source/wtf/TypeTraits.h

Index: Source/wtf/TypeTraits.h
diff --git a/Source/wtf/TypeTraits.h b/Source/wtf/TypeTraits.h
index 4d91f674704663c2113c9209e901bc452212ef7b..18a21e63fd648babc47082c5181941fd1815b5a4 100644
--- a/Source/wtf/TypeTraits.h
+++ b/Source/wtf/TypeTraits.h
@@ -29,7 +29,6 @@ namespace WTF {
     // The following are provided in this file:
     //
     //   IsInteger<T>::value
-    //   IsPod<T>::value, see the definition for a note about its limitations
     //   IsConvertibleToInteger<T>::value
     //
     //   IsArray<T>::value
@@ -79,11 +78,6 @@ namespace WTF {
         WeakHandlingInCollections
     };
 
-    // IsPod is misnamed as it doesn't cover all plain old data (pod) types.
-    // Specifically, it doesn't allow for enums or for structs.
-    template <typename T> struct IsPod              { static const bool value = IsArithmetic<T>::value; };
-    template <typename P> struct IsPod<P*>          { static const bool value = true; };
-
     template<typename T> class IsConvertibleToInteger {
         // Avoid "possible loss of data" warning when using Microsoft's C++ compiler
         // by not converting int's to doubles.