Update test implementation of ISemanticFactsService.

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

@@ -475,7 +475,7 @@ public IEnumerable<SyntaxNode> GetConstructors(SyntaxNode root, CancellationToke
                 throw new NotImplementedException();
             }
 
-            public SyntaxNode GetContainingMemberDeclaration(SyntaxNode root, int position)
+            public SyntaxNode GetContainingMemberDeclaration(SyntaxNode root, int position, bool useFullSpan = true)
             {
                 throw new NotImplementedException();
             }

src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/CrefCompletionProviderTests.vb

@@ -471,7 +471,7 @@ End Class]]></a>.Value.NormalizeLineEndings()
                 Throw New NotImplementedException()
             End Function
 
-            Public Function GetContainingMemberDeclaration(root As SyntaxNode, position As Integer) As SyntaxNode Implements ISyntaxFactsService.GetContainingMemberDeclaration
+            Public Function GetContainingMemberDeclaration(root As SyntaxNode, position As Integer, Optional useFullSpan As Boolean = True) As SyntaxNode Implements ISyntaxFactsService.GetContainingMemberDeclaration
                 Throw New NotImplementedException()
             End Function