Mojo C++ bindings: switch the existing usage of StructTraits to use the new data view interface.

mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl

 // Copyright 2013 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.
 
 {%- if variant -%}
 {%-   set variant_path = "%s-%s"|format(module.path, variant) -%}
 {%- else -%}
 {%-   set variant_path = module.path -%}
 {%- endif -%}
 
@@ skipping 107 matching lines @@
     mojo::AssociatedInterfaceRequest<{{interface.name}}>;
 {%  endfor %}
 
 {#--- Struct Forward Declarations -#}
 {%  for struct in structs %}
 {%-   if struct|is_native_only_kind %}
 using {{struct.name}} = mojo::NativeStruct;
 using {{struct.name}}Ptr = mojo::NativeStructPtr;
 {%-   else %}
 class {{struct.name}};
-class {{struct.name}}_Reader;
 class {{struct.name}}DataView;
 {%-     if struct|should_inline %}
 using {{struct.name}}Ptr = mojo::InlinedStructPtr<{{struct.name}}>;
 {%-     else %}
 using {{struct.name}}Ptr = mojo::StructPtr<{{struct.name}}>;
 {%-     endif %}
 {%-   endif %}
 {%  endfor %}
 
 {#--- Union Forward Declarations -#}
@@ skipping 89 matching lines @@
 {#--- Union Serialization Helpers -#}
 {%  if unions %}
 {%-   for union in unions %}
 {%      include "union_serialization_declaration.tmpl" %}
 {%-   endfor %}
 {%- endif %}
 
 }  // namespace mojo
 
 #endif  // {{header_guard}}