/**
     * Remove a field definition from an existing Type.
     *
     * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException If the given field definition does not belong to the given type
     * @throws \eZ\Publish\API\Repository\Exceptions\UnauthorizedException if the user is not allowed to edit a content type
     *
     * @param \eZ\Publish\API\Repository\Values\ContentType\ContentTypeDraft $contentTypeDraft
     * @param \eZ\Publish\API\Repository\Values\ContentType\FieldDefinition $fieldDefinition
     */
    public function removeFieldDefinition( APIContentTypeDraft $contentTypeDraft, APIFieldDefinition $fieldDefinition )
    {
        if ( $this->repository->hasAccess( 'class', 'update' ) !== true )
            throw new UnauthorizedException( 'ContentType', 'update' );

        $loadedFieldDefinition = $this->loadContentTypeDraft(
            $contentTypeDraft->id
        )->getFieldDefinition(
            $fieldDefinition->identifier
        );

        if ( empty( $loadedFieldDefinition ) || $loadedFieldDefinition->id != $fieldDefinition->id )
        {
            throw new InvalidArgumentException(
                "\$fieldDefinition",
                "The given FieldDefinition does not belong to the ContentType"
            );
        }

        $this->repository->beginTransaction();
        try
        {
            $this->contentTypeHandler->removeFieldDefinition(
                $contentTypeDraft->id,
                SPIContentType::STATUS_DRAFT,
                $fieldDefinition->id
            );
            $this->repository->commit();
        }
        catch ( Exception $e )
        {
            $this->repository->rollback();
            throw $e;
        }
    }
 /**
  * Removes a field definition from an existing Type.
  *
  * This method creates a new status of the Type with the field definition
  * referred to by $fieldDefinitionId removed. It does not update existing
  * content objects depending on the field (default) values.
  *
  * @param mixed $contentTypeId
  * @param mixed $fieldDefinitionId
  * @return boolean
  */
 public function removeFieldDefinition($contentTypeId, $status, $fieldDefinitionId)
 {
     $this->clearCache();
     return $this->innerHandler->removeFieldDefinition($contentTypeId, $status, $fieldDefinitionId);
 }