[spaces.mapper.product] move out of Mapper namespace

dune/gdt/spaces/mapper/product.hh

@@ -17,7 +17,6 @@
 
 namespace Dune {
 namespace GDT {
-namespace Mapper {
 
 
 // forward
@@ -282,7 +281,6 @@ private:
 }; // class DefaultProductMapper
 
 
-} // namespace Mapper
 } // namespace GDT
 } // namespace Dune
 

dune/gdt/spaces/product.hh

@@ -74,7 +74,7 @@ public:
   typedef typename GridViewType::IndexSet BackendType;
   typedef typename std::tuple_element<0, std::tuple<SpaceImps...>>::type::RangeFieldType RangeFieldType;
   typedef typename std::tuple<SpaceImps...> SpaceTupleType;
-  typedef typename Dune::GDT::Mapper::DefaultProductMapper<GridViewType, typename SpaceImps::MapperType...> MapperType;
+  typedef typename Dune::GDT::DefaultProductMapper<GridViewType, typename SpaceImps::MapperType...> MapperType;
   typedef typename Dune::GDT::BaseFunctionSet::ProductDefault<typename SpaceImps::BaseFunctionSetType...>
       BaseFunctionSetType;
   static const int polOrder    = internal::maxPolOrder<SpaceImps...>::polOrder;