Fix a bug with mojom imports where 2 imports with the same namespace would

mojo/public/bindings/generators/js_templates/struct_definition.tmpl

Index: mojo/public/bindings/generators/js_templates/struct_definition.tmpl
diff --git a/mojo/public/bindings/generators/js_templates/struct_definition.tmpl b/mojo/public/bindings/generators/js_templates/struct_definition.tmpl
index df1ad15de450fdfcb98134d1a181ff9438eb6e91..3c836dda795415c499a53bf86bb738f1eb6274ed 100644
--- a/mojo/public/bindings/generators/js_templates/struct_definition.tmpl
+++ b/mojo/public/bindings/generators/js_templates/struct_definition.tmpl
@@ -1,7 +1,7 @@
 {%- macro set_default(kind, value, depth) -%}
 {#--- Strings ---#}
 {%-   if kind|is_string_kind -%}
-{{caller(value)}}
+{{caller(value|substitute_namespace(imports))}}
 {#--- Arrays ---#}
 {%-   elif kind|is_array_kind %}
 {%-     set _ = value|verify_token_type("ARRAY") %}
@@ -20,7 +20,7 @@ tmp{{depth}}[{{loop.index0}}] = {{result}};
 {%-   elif kind|is_object_kind %}
 {%-     set _ = value|verify_token_type("OBJECT") %}
 {
-  var tmp{{depth}} = new {{kind|js_type}}();
+  var tmp{{depth}} = new {{kind|js_type(imports)}}();
 {%-   set struct = kinds[kind.spec] %}
 {%-   for element in value[1] %}
 {#-     Use struct.packed_fields to order struct values by ordinal number #}
@@ -35,7 +35,7 @@ tmp{{depth}}.{{subfield.name}} = {{result}};
 }
 {#--- POD types ---#}
 {%-   else -%}
-{{caller(value)}}
+{{caller(value|substitute_namespace(imports))}}
 {%-   endif %}
 {%- endmacro %}