Remove parameter.

src/EditorFeatures/Core/Extensibility/Completion/CompletionHelper.cs

@@ -19,8 +19,7 @@ protected CompletionHelper()
         {
         }
 
-        public static CompletionHelper GetHelper(
-            Workspace workspace, string language, CompletionService completionService)
+        public static CompletionHelper GetHelper(Workspace workspace, string language)
         {
             var ls = workspace.Services.GetLanguageServices(language);
             if (ls != null)
@@ -31,18 +30,15 @@ protected CompletionHelper()
                     return factory.CreateCompletionHelper();
                 }
 
-                if (completionService != null)
-                {
-                    return new CompletionHelper();
-                }
+                return new CompletionHelper();
             }
 
             return null;
         }
 
-        public static CompletionHelper GetHelper(Document document, CompletionService service)
+        public static CompletionHelper GetHelper(Document document)
         {
-            return GetHelper(document.Project.Solution.Workspace, document.Project.Language, service);
+            return GetHelper(document.Project.Solution.Workspace, document.Project.Language);
         }
 
         public IReadOnlyList<TextSpan> GetHighlightedSpans(CompletionItem completionItem, string filterText)

src/EditorFeatures/Core/Implementation/IntelliSense/Completion/Controller_TypeChar.cs

@@ -272,8 +272,7 @@ private CompletionHelper GetCompletionHelper()
             var document = this.SubjectBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChanges();
             if (document != null)
             {
-                return CompletionHelper.GetHelper(
-                    document, document.GetLanguageService<CompletionService>());
+                return CompletionHelper.GetHelper(document);
             }
 
             return null;

src/EditorFeatures/Next/IntelliSense/Completion/Presentation/Roslyn15CompletionSet.cs

@@ -62,8 +62,7 @@ private CompletionHelper GetCompletionHelper()
                 var document = GetDocument();
                 if (document != null)
                 {
-                    _completionHelper = CompletionHelper.GetHelper(document,
-                        document.Project.LanguageServices.GetService<CompletionService>());
+                    _completionHelper = CompletionHelper.GetHelper(document);
                 }
             }
 

src/EditorFeatures/Test/Completion/AbstractCompletionProviderTests.cs

@@ -58,9 +58,9 @@ internal CompletionServiceWithProviders GetCompletionService(Workspace workspace
         internal abstract CompletionServiceWithProviders CreateCompletionService(
             Workspace workspace, ImmutableArray<CompletionProvider> exclusiveProviders);
 
-        internal static CompletionHelper GetCompletionHelper(Document document, CompletionService service)
+        internal static CompletionHelper GetCompletionHelper(Document document)
         {
-            return CompletionHelper.GetHelper(document, service);
+            return CompletionHelper.GetHelper(document);
         }
 
         internal static async Task<CompletionContext> GetCompletionListContextAsync(
@@ -310,7 +310,7 @@ private async Task VerifyCustomCommitProviderCheckResultsAsync(Document document
             var customCommitCompletionProvider = service.ExclusiveProviders?[0] as ICustomCommitCompletionProvider;
             if (customCommitCompletionProvider != null)
             {
-                var completionRules = GetCompletionHelper(document, service);
+                var completionRules = GetCompletionHelper(document);
                 var textView = (await WorkspaceFixture.GetWorkspaceAsync()).Documents.Single().GetTextView();
                 VerifyCustomCommitWorker(service, customCommitCompletionProvider, firstItem, completionRules, textView, textBuffer, codeBeforeCommit, expectedCodeAfterCommit, commitChar);
             }
@@ -416,7 +416,7 @@ private async Task VerifyCustomCommitProviderCheckResultsAsync(Document document
             var items = (await GetCompletionListAsync(service, document, position, CompletionTrigger.Default)).Items;
             var firstItem = items.First(i => CompareItems(i.DisplayText, itemToCommit));
 
-            var completionRules = GetCompletionHelper(document, service);
+            var completionRules = GetCompletionHelper(document);
             var commitChar = commitCharOpt ?? '\t';
 
             var text = await document.GetTextAsync();

src/EditorFeatures/Test2/IntelliSense/CompletionRulesTests.vb

@@ -48,8 +48,7 @@ Namespace Microsoft.CodeAnalysis.Editor.UnitTests.IntelliSense
         Private Sub TestMatches(v As String, wordsToMatch() As String)
             Using New CultureContext("tr-TR")
                 Dim workspace = New TestWorkspace
-                Dim helper = CompletionHelper.GetHelper(workspace, LanguageNames.CSharp,
-                                                        workspace.Services.GetLanguageServices(LanguageNames.CSharp).GetService(Of CompletionService))
+                Dim helper = CompletionHelper.GetHelper(workspace, LanguageNames.CSharp)
                 For Each word In wordsToMatch
                     Dim item = CompletionItem.Create(word)
                     Assert.True(helper.MatchesFilterText(item, v, CompletionTrigger.Default, CompletionFilterReason.TypeChar), $"Expected item {word} does not match {v}")
@@ -60,8 +59,7 @@ Namespace Microsoft.CodeAnalysis.Editor.UnitTests.IntelliSense
         Private Sub TestNotMatches(v As String, wordsToNotMatch() As String)
             Using New CultureContext("tr-TR")
                 Dim workspace = New TestWorkspace
-                Dim helper = CompletionHelper.GetHelper(workspace, LanguageNames.CSharp,
-                                                        workspace.Services.GetLanguageServices(LanguageNames.CSharp).GetService(Of CompletionService))
+                Dim helper = CompletionHelper.GetHelper(workspace, LanguageNames.CSharp)
                 For Each word In wordsToNotMatch
                     Dim item = CompletionItem.Create(word)
                     Assert.False(helper.MatchesFilterText(item, v, CompletionTrigger.Default, CompletionFilterReason.TypeChar), $"Unexpected item {word} matches {v}")

src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/AbstractVisualBasicCompletionProviderTests.vb

@@ -142,7 +142,7 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Completion.Complet
                 Dim completionList = Await GetCompletionListAsync(service, document, position, CompletionTrigger.Default)
                 Dim item = completionList.Items.First()
 
-                Dim helper = CompletionHelper.GetHelper(document, service)
+                Dim helper = CompletionHelper.GetHelper(document)
 
                 For Each ch In chars
                     Assert.True(Controller.IsCommitCharacter(service.GetRules(), item, ch, textTypedSoFar), $"Expected '{ch}' to be a commit character")