Respond to CI comments

src/Compilers/VisualBasic/Portable/Errors/LocalizableErrorArgument.vb

@@ -21,12 +21,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         '''Creates a string representing the unformatted LocalizableErrorArgument instance.
         ''' </summary>
         Public Overrides Function ToString() As String
-            Return ToString(Nothing, Nothing)
-        End Function
-
-        <Obsolete("Use " + NameOf(ToString) + " instead", True)>
-        Public Function ToString_IFormattable(format As String, formatProvider As IFormatProvider) As String
-            Return ToString(Nothing, Nothing)
+            Return ToString_IFormattable(Nothing, Nothing)
         End Function
 
         ''' <summary>
@@ -34,7 +29,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         ''' </summary>
         ''' <param name="format">A string to use for formatting.</param>
         ''' <param name="formatProvider">An object that supplies culture-specific format information about format.</param>
-        Public Overloads Function ToString(format As String, formatProvider As IFormatProvider) As String Implements IFormattable.ToString
+        Public Function ToString_IFormattable(format As String, formatProvider As IFormatProvider) As String Implements IFormattable.ToString
             Return ErrorFactory.IdToString(_id, DirectCast(formatProvider, CultureInfo))
         End Function
     End Structure

src/Compilers/VisualBasic/Portable/PublicAPI.txt

@@ -3295,7 +3295,6 @@ NotOverridable Overrides Microsoft.CodeAnalysis.VisualBasic.Syntax.SimpleArgumen
 NotOverridable Overrides Microsoft.CodeAnalysis.VisualBasic.VisualBasicSyntaxNode.ToFullString() -> String
 NotOverridable Overrides Microsoft.CodeAnalysis.VisualBasic.VisualBasicSyntaxNode.ToString() -> String
 Overloads Microsoft.CodeAnalysis.VisualBasic.Conversion.Equals(other As Microsoft.CodeAnalysis.VisualBasic.Conversion) -> Boolean
-Overloads Microsoft.CodeAnalysis.VisualBasic.LocalizableErrorArgument.ToString(format As String, formatProvider As System.IFormatProvider) -> String
 Overloads Microsoft.CodeAnalysis.VisualBasic.GlobalImport.Equals(other As Microsoft.CodeAnalysis.VisualBasic.GlobalImport) -> Boolean
 Overloads Microsoft.CodeAnalysis.VisualBasic.VisualBasicCompilationOptions.Equals(other As Microsoft.CodeAnalysis.VisualBasic.VisualBasicCompilationOptions) -> Boolean
 Overloads Microsoft.CodeAnalysis.VisualBasic.VisualBasicParseOptions.Equals(other As Microsoft.CodeAnalysis.VisualBasic.VisualBasicParseOptions) -> Boolean