[dart-dio] Remove unused code (#8196)

Author: kuhnroyal

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioClientCodegen.java

@@ -45,7 +45,6 @@ public class DartDioClientCodegen extends DartClientCodegen {
     public static final String NULLABLE_FIELDS = "nullableFields";
     public static final String DATE_LIBRARY = "dateLibrary";
 
-    private static final String IS_FORMAT_JSON = "jsonFormat";
     private static final String CLIENT_NAME = "clientName";
 
     private boolean nullableFields = true;
@@ -144,13 +143,6 @@ public String toDefaultValue(Schema schema) {
         }
     }
 
-    @Override
-    protected void addAdditionPropertiesToCodeGenModel(CodegenModel codegenModel, Schema schema) {
-        //super.addAdditionPropertiesToCodeGenModel(codegenModel, schema);
-        codegenModel.additionalPropertiesType = getSchemaType(getAdditionalProperties(schema));
-        addImport(codegenModel, codegenModel.additionalPropertiesType);
-    }
-
     @Override
     public void processOpts() {
         defaultProcessOpts();
@@ -167,8 +159,6 @@ public void processOpts() {
             additionalProperties.put(NULLABLE_FIELDS, nullableFields);
         }
 
-        additionalProperties.put(IS_FORMAT_JSON, true);
-
         if (additionalProperties.containsKey(PUB_LIBRARY)) {
             this.setPubLibrary((String) additionalProperties.get(PUB_LIBRARY));
         } else {