Cpp bindings: add typedef for callbacks.

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.
 
 {%- set header_guard = "%s_H_"|
         format(module.path|upper|replace("/","_")|replace(".","_")) %}
 
 #ifndef {{header_guard}}
 #define {{header_guard}}
 
@@ skipping 22 matching lines @@
 {%- endfor %}
 
 {#--- Enums #}
 {%  for enum in enums %}
 {%    include "enum_declaration.tmpl" %}
 {%- endfor %}
 
 {#--- Interface Forward Declarations -#}
 {%  for interface in interfaces %}
 class {{interface.name}};
-typedef mojo::InterfacePtr<{{interface.name}}> {{interface.name}}Ptr;
+using {{interface.name}}Ptr = mojo::InterfacePtr<{{interface.name}}>;
 {%  endfor %}
 
 {#--- Struct Forward Declarations -#}
 {%  for struct in structs %}
 class {{struct.name}};
 {%    if struct|should_inline %}
-typedef mojo::InlinedStructPtr<{{struct.name}}> {{struct.name}}Ptr;
+using {{struct.name}}Ptr = mojo::InlinedStructPtr<{{struct.name}}>;
 {%    else %}
-typedef mojo::StructPtr<{{struct.name}}> {{struct.name}}Ptr;
+using {{struct.name}}Ptr = mojo::StructPtr<{{struct.name}}>;
 {%    endif %}
 {%  endfor %}
 
 {#--- NOTE: Non-inlined structs may have pointers to inlined structs, so we  #}
 {#---       need to fully define inlined structs ahead of the others.        #}
 
 {#--- Inlined structs #}
 {%  for struct in structs %}
 {%    if struct|should_inline %}
 {%      include "wrapper_class_declaration.tmpl" %}
@@ skipping 37 matching lines @@
 {%    for struct in structs %}
 {%      include "struct_serialization_declaration.tmpl" %}
 {%-   endfor %}
 {%- endif %}
 
 {%- for namespace in namespaces_as_array|reverse %}
 }  // namespace {{namespace}}
 {%- endfor %}
 
 #endif  // {{header_guard}}