Simplify code.

src/Features/Core/Portable/ExtractMethod/MethodExtractor.CodeGenerator.cs

@@ -82,7 +82,7 @@ public async Task<GeneratedCode> GenerateAsync(CancellationToken cancellationTok
                 // it is possible in a script file case where there is no previous member. in that case, insert new text into top level script
                 var destination = (previousMemberNode.Parent == null) ? previousMemberNode : previousMemberNode.Parent;
 
-                var codeGenerationService = this.SemanticDocument.Document.Project.LanguageServices.GetService<ICodeGenerationService>();
+                var codeGenerationService = this.SemanticDocument.Document.GetLanguageService<ICodeGenerationService>();
 
                 var result = this.GenerateMethodDefinition(cancellationToken);
                 var newContainer = codeGenerationService.AddMethod(