More fix on generating correct C++ symbol name for scoped native enums

mojo/public/tools/bindings/generators/cpp_templates/module-shared-internal.h.tmpl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 {%- set header_guard = "%s_SHARED_INTERNAL_H_"|format(
         module.path|upper|replace("/","_")|replace(".","_")|
             replace("-", "_")) %}
 
 #ifndef {{header_guard}}
 #define {{header_guard}}
@@ skipping 32 matching lines @@
 {%- endfor %}
 
 {%- for union in unions %}
 class {{union.name}}_Data;
 {%- endfor %}
 
 {#--- Enums #}
 {%- from "enum_macros.tmpl" import enum_data_decl -%}
 {%- for enum in all_enums %}
 {%-   if enum|is_native_only_kind %}
-using {{enum.name}}_Data = mojo::internal::NativeEnum_Data;
+using {{enum|get_name_for_kind(flatten_nested_kind=True)}}_Data =
+    mojo::internal::NativeEnum_Data;
 {%-   else %}
 {{enum_data_decl(enum)}}
 {%-   endif %}
 {%- endfor %}
 
 #pragma pack(push, 1)
 
 {#--- Unions must be declared first because they can be members of structs #}
 {#--- Union class declarations #}
 {%- for union in unions %}
@@ skipping 22 matching lines @@
 {%- endfor %}
 
 #pragma pack(pop)
 
 }  // namespace internal
 {%- for namespace in namespaces_as_array|reverse %}
 }  // namespace {{namespace}}
 {%- endfor %}
 
 #endif  // {{header_guard}}