Make some foo.h headers usable without foo-inl.h header.

src/types-inl.h

Index: src/types-inl.h
diff --git a/src/types-inl.h b/src/types-inl.h
index 762a11df303d85f6c8289d8526564233140def4d..084f5db812d79e5431a7bf0877d1417151e4fef2 100644
--- a/src/types-inl.h
+++ b/src/types-inl.h
@@ -69,13 +69,6 @@ bool TypeImpl<Config>::NowContains(i::Object* value) {
 
 // static
 template<class T>
-T* ZoneTypeConfig::null_handle() {
-  return NULL;
-}
-
-
-// static
-template<class T>
 T* ZoneTypeConfig::handle(T* type) {
   return type;
 }
@@ -283,13 +276,6 @@ void ZoneTypeConfig::range_set_double(ZoneTypeConfig::Range* range, int index,
 
 // static
 template<class T>
-i::Handle<T> HeapTypeConfig::null_handle() {
-  return i::Handle<T>();
-}
-
-
-// static
-template<class T>
 i::Handle<T> HeapTypeConfig::handle(T* type) {
   return i::handle(type, i::HeapObject::cast(type)->GetIsolate());
 }