Remove raw pointer deprecation warnings.

See discussion in 2016 beta forums for rationale.

Change-Id: I86a4c1bd61655f4895e2fe0e935f25dc8a89d830

wpilibc/shared/include/Base.h

@@ -54,11 +54,8 @@ ClassName(ClassName &&) = default
 
 // A struct to use as a deleter when a std::shared_ptr must wrap a raw pointer
 // that is being deleted by someone else.
-// This should only be called in deprecated functions; using it anywhere else
-// will throw warnings.
 template<class T>
 struct
-DEPRECATED("wrapping raw pointer in std::shared_ptr")
 NullDeleter {
   void operator()(T *) const noexcept {};
 };