Revert of Reland: Mojo C++ bindings: replace '::' with '.' in the interface name.

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

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- import "struct_macros.tmpl" as struct_macros %}
 
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
+{%- set namespace_as_string = "%s"|format(namespace|replace(".","::")) %}
 
 {%- macro alloc_params(struct, serialization_context) %}
   bool success = true;
 {%-   for param in struct.packed.packed_fields_in_ordinal_order %}
   {{param.field.kind|cpp_wrapper_type}} p_{{param.field.name}}{};
 {%-   endfor %}
   {{struct_macros.deserialize(struct, "params", "p_%s", serialization_context, "success")}}
   if (!success)
     return false;
 {%- endmacro %}
@@ skipping 11 matching lines @@
 
 {%- macro build_message(struct, input_pattern, struct_display_name,
                         serialization_context) -%}
   {{struct_macros.serialize(struct, struct_display_name, input_pattern,
                             "params", "builder.buffer()",
                             serialization_context)}}
   params->EncodePointersAndHandles(builder.message()->mutable_handles());
 {%- endmacro %}
 
 {#--- Begin #}
-MOJO_STATIC_CONST_MEMBER_DEFINITION const char {{class_name}}::Name_[] = "{{namespace}}.{{class_name}}";
+MOJO_STATIC_CONST_MEMBER_DEFINITION const char {{class_name}}::Name_[] = "{{namespace_as_string}}::{{class_name}}";
 MOJO_STATIC_CONST_MEMBER_DEFINITION 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}};
 {%-   else %}
 MOJO_STATIC_CONST_MEMBER_DEFINITION const {{constant.kind|cpp_pod_type}} {{interface.name}}::{{constant.name}} = {{constant|constant_value}};
 {%-   endif %}
 {%- endfor %}
@@ skipping 351 matching lines @@
     default:
       break;
   }
 
   // Unrecognized message.
   ReportValidationError(
       mojo::internal::VALIDATION_ERROR_MESSAGE_HEADER_UNKNOWN_METHOD);
   return false;
 }
 {%- endif -%}