Fix a build break due to a warning about a namespace with no accessible...

Fix a build break due to a warning about a namespace with no accessible members. (changeset 1323607)

Src/Samples/VisualBasic/ConvertToAutoProperty/Test/ConvertToAutoPropertyTests.vb

@@ -24,7 +24,6 @@ Imports ConvertToAutoPropertyVB
 Imports Microsoft.CodeAnalysis
 Imports Microsoft.CodeAnalysis.CodeActions
 Imports Microsoft.CodeAnalysis.CodeRefactorings
-Imports Microsoft.CodeAnalysis.Editor
 Imports Microsoft.CodeAnalysis.Text
 Imports Roslyn.UnitTestFramework
 Imports Xunit