Revert back to previous test behavior. As we're no longer doing a linear...

Revert back to previous test behavior.  As we're no longer doing a linear walk, we no longer find these types.

src/EditorFeatures/CSharpTest/Diagnostics/AddUsing/AddUsingTests.cs

@@ -80,9 +80,8 @@ public async Task TestGenericWithWrongArgs1()
         [WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddUsing)]
         public async Task TestGenericWithWrongArgs2()
         {
-            await TestAsync(
-@"class Class { [|List<int,string>|] Method() { Foo(); } }",
-@"using System.Collections.Generic; class Class { SortedList<int,string> Method() { Foo(); } }");
+            await TestMissingAsync(
+@"class Class { [|List<int,string>|] Method() { Foo(); } }");
         }
 
         [WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddUsing)]

src/EditorFeatures/VisualBasicTest/Diagnostics/AddImport/AddImportTests.vb

@@ -166,9 +166,8 @@ NewLines("Class Foo \n Function F() As [|List(Of Integer, String, Boolean)|] \n
 
         <WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddImport)>
         Public Async Function TestGenericWithWrongArgs2() As Task
-            Await TestAsync(
-NewLines("Class Foo \n Function F() As [|List(Of Integer, String)|] \n End Function \n End Class"),
-NewLines("Imports System.Collections.Generic \n Class Foo \n Function F() As SortedList(Of Integer, String) \n End Function \n End Class"))
+            Await TestMissingAsync(
+NewLines("Class Foo \n Function F() As [|List(Of Integer, String)|] \n End Function \n End Class"))
         End Function
 
         <WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddImport)>