Remove MOJO_STATIC_CONST_MEMBER_DEFINITION.

mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- import "struct_macros.tmpl" as struct_macros %}
 {%- from "enum_macros.tmpl" import is_valid_enum_def %}
 {%- from "enum_macros.tmpl" import global_enum_operators_def %}
 
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
 
 {%- macro alloc_params(struct) %}
 {%-   for param in struct.packed.packed_fields_in_ordinal_order %}
@@ skipping 13 matching lines @@
 {%-   endfor %}
 {%- endmacro %}
 
 {%- macro build_message(struct, struct_display_name) -%}
   {{struct_macros.serialize(struct, struct_display_name, "in_%s", "params", "builder.buffer()", false)}}
   params->EncodePointersAndHandles(builder.message()->mutable_handles());
 {%- endmacro %}
 
 {#--- Begin #}
 {%- if interface.service_name %}
-MOJO_STATIC_CONST_MEMBER_DEFINITION const char {{class_name}}::Name_[] = "{{interface.service_name}}";
+const char {{class_name}}::Name_[] = "{{interface.service_name}}";
 {%- endif %}
-MOJO_STATIC_CONST_MEMBER_DEFINITION const uint32_t {{class_name}}::Version_;
+const uint32_t {{class_name}}::Version_;
 
 {#--- Constants #}
 {%-  for constant in interface.constants %}
 {%-   if constant.kind|is_integral_kind %}
-MOJO_STATIC_CONST_MEMBER_DEFINITION const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}};
+const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}};
 {%-   else %}
-MOJO_STATIC_CONST_MEMBER_DEFINITION const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}} = {{constant|constant_value}};
+const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}} = {{constant|constant_value}};
 {%-   endif %}
 {%- endfor %}
 
 {#--- Enums #}
 {%- for enum in interface.enums %}
   {{is_valid_enum_def(enum, class_name=interface.name)}}
   {{global_enum_operators_def(enum, class_name=interface.name)}}
 {%- endfor %}
 
 {#--- ForwardToCallback definition #}
@@ skipping 329 matching lines @@
   // Unrecognized message.
   MOJO_INTERNAL_DEBUG_SET_ERROR_MSG(err) << "unknown response message name '"
                                           << message->header()->name
                                           << "' for interface "
                                              "'{{interface.name}}'";
   ReportValidationError(
       mojo::internal::ValidationError::MESSAGE_HEADER_UNKNOWN_METHOD, err);
   return mojo::internal::ValidationError::MESSAGE_HEADER_UNKNOWN_METHOD;
 }
 {%- endif -%}