* remove class DenseDirectAccessBase

* remove member XprBase typedefs, use ei_dense_xpr_base
* remove member _HasDirectAccess typedefs, use ei_has_direct_access

Eigen/src/Array/ArrayBase.h

@@ -73,7 +73,6 @@ template<typename Derived> class ArrayBase
     using Base::IsVectorAtCompileTime;
     using Base::Flags;
     using Base::CoeffReadCost;
-    using Base::_HasDirectAccess;
 
     using Base::derived;
     using Base::const_cast_derived;