Remove some test input to reduce execution time

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

@@ -76,34 +76,16 @@ private static IEnumerable<List<object>> BuiltInTypes
         {
             get
             {
-                var predefinedTypes = new List<List<string>>
-                {
-                    new List<string>()
-                    { "int", "Int32", "System.Int32" },
-                    new List<string>()
-                    { "float", "Single", "System.Single" },
-                    new List<string>()
-                    { "uint", "UInt32", "System.UInt32" },
-                    new List<string>()
-                    { "bool", "Boolean", "System.Boolean"},
-                    new List<string>()
-                    { "string", "String", "System.String"},
-                    new List<string>()
-                    { "object", "Object", "System.Object"},
-                };
-
+                var predefinedTypes = new List<string>() { "string", "String", "System.String" };
                 var arraySuffixes = new[] { "", "[]", "[,]" };
 
-                foreach (var group in predefinedTypes)
+                foreach (var type1 in predefinedTypes)
                 {
-                    foreach (var type1 in group)
+                    foreach (var type2 in predefinedTypes)
                     {
-                        foreach (var type2 in group)
+                        foreach (var suffix in arraySuffixes)
                         {
-                            foreach (var suffix in arraySuffixes)
-                            {
-                                yield return new List<object>() { type1 + suffix, type2 + suffix };
-                            }
+                            yield return new List<object>() { type1 + suffix, type2 + suffix };
                         }
                     }
                 }