Remove IFileSystemUtils from IOC container (microsoft#8898)

Author: DonJayamanne

src/client/common/platform/fileSystem.ts

@@ -318,7 +318,6 @@ export class RawFileSystem implements IRawFileSystem {
 }
 
 // High-level filesystem operations used by the extension.
-@injectable()
 export class FileSystemUtils implements IFileSystemUtils {
     constructor(
         public readonly raw: IRawFileSystem,

src/client/common/platform/serviceRegistry.ts

@@ -3,14 +3,13 @@
 'use strict';
 
 import { IServiceManager } from '../../ioc/types';
-import { FileSystem, FileSystemUtils } from './fileSystem';
+import { FileSystem } from './fileSystem';
 import { PlatformService } from './platformService';
 import { RegistryImplementation } from './registry';
-import { IFileSystem, IFileSystemUtils, IPlatformService, IRegistry } from './types';
+import { IFileSystem, IPlatformService, IRegistry } from './types';
 
 export function registerTypes(serviceManager: IServiceManager) {
     serviceManager.addSingleton<IPlatformService>(IPlatformService, PlatformService);
     serviceManager.addSingleton<IFileSystem>(IFileSystem, FileSystem);
-    serviceManager.addSingletonInstance<IFileSystemUtils>(IFileSystemUtils, FileSystemUtils.withDefaults());
     serviceManager.addSingleton<IRegistry>(IRegistry, RegistryImplementation);
 }

src/client/common/platform/types.ts

@@ -101,7 +101,6 @@ export interface IRawFileSystem {
 }
 
 // High-level filesystem operations used by the extension.
-export const IFileSystemUtils = Symbol('IFileSystemUtils');
 export interface IFileSystemUtils {
     readonly raw: IRawFileSystem;
     readonly paths: IFileSystemPaths;