Address review comments

src/EditorFeatures/CSharpTest/Completion/CompletionProviders/ExtensionMethodImportCompletionProviderTests.cs

@@ -167,31 +167,31 @@ public void M({type2} x)
         [Theory, Trait(Traits.Feature, Traits.Features.Completion)]
         public async Task UsingAliasInDeclaration(ReferenceType refType)
         {
-            var file1 = $@"
+            var file1 = @"
 using System;
 using MyInt = System.Int32;
 
 namespace Foo
-{{
+{
     public static class ExtensionClass
-    {{
+    {
         public static bool ExtentionMethod(this MyInt x)
             => true;
-    }}
-}}";
-            var file2 = $@"
+    }
+}";
+            var file2 = @"
 using System;
 
 namespace Baz
-{{
+{
     public class Bat
-    {{
+    {
         public void M(int x)
-        {{
+        {
             x.$$
-        }}
-    }}
-}}";
+        }
+    }
+}";
             var markup = GetMarkup(file2, file1, refType);
 
             await VerifyTypeImportItemExistsAsync(

src/Features/Core/Portable/Completion/Providers/ImportCompletionProvider/ExtensionMethodImportCompletionService.cs

@@ -319,6 +319,7 @@ internal static partial class ExtensionMethodImportCompletionService
                     conflictTypeRootNode.Add(fullyQualifiedContainerName, (qualifiedNamespaceName, methodNames));
                 }
             }
+
             var ticks = Environment.TickCount;
 
             GetItemsFromConflictingTypes(rootNamespaceSymbol, conflictTypeRootNode, builder, receiverTypeSymbol, semanticModel, position, counter);

src/Workspaces/VisualBasic/Portable/FindSymbols/VisualBasicDeclaredSymbolInfoFactoryService.vb

@@ -16,6 +16,9 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.FindSymbols
     Friend Class VisualBasicDeclaredSymbolInfoFactoryService
         Inherits AbstractDeclaredSymbolInfoFactoryService
 
+        Private Const ExtensionName As String = "Extension"
+        Private Const ExtensionAttributeName As String = "ExtensionAttribute"
+
         <ImportingConstructor>
         Public Sub New()
         End Sub
@@ -307,7 +310,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.FindSymbols
                     End If
 
                     Dim name = attribute.Name.GetRightmostName()?.ToString()
-                    If String.Equals(name, "Extension", StringComparison.OrdinalIgnoreCase) Or String.Equals(name, "ExtensionAttribute", StringComparison.OrdinalIgnoreCase) Then
+                    If String.Equals(name, ExtensionName, StringComparison.OrdinalIgnoreCase) Or String.Equals(name, ExtensionAttributeName, StringComparison.OrdinalIgnoreCase) Then
                         Return True
                     End If
                 Next