Remove import

Author: satyakigh

src/document/DocumentManager.ts

@@ -6,7 +6,6 @@ import { LoggerFactory } from '../telemetry/LoggerFactory';
 import { ScopedTelemetry } from '../telemetry/ScopedTelemetry';
 import { Telemetry } from '../telemetry/TelemetryDecorator';
 import { Delayer } from '../utils/Delayer';
-import { byteSize } from '../utils/String';
 import { CloudFormationFileType, Document, DocumentType } from './Document';
 import { DocumentMetadata } from './DocumentProtocol';