[dotnet] remove download url parameter from driver service constructor

nothing is done with this parameter and users passing in a value should get an error rather than having it be ignored

dotnet/src/webdriver/Chromium/ChromiumDriverService.cs

@@ -45,8 +45,7 @@ public abstract class ChromiumDriverService : DriverService
         /// <param name="executablePath">The full path to the ChromeDriver executable.</param>
         /// <param name="executableFileName">The file name of the ChromeDriver executable.</param>
         /// <param name="port">The port on which the ChromeDriver executable should listen.</param>
-        /// <param name="downloadUrl">The URL from which the driver executable can be downloaded.</param>
-        protected ChromiumDriverService(string executablePath, string executableFileName, int port, Uri downloadUrl = null)
+        protected ChromiumDriverService(string executablePath, string executableFileName, int port)
             : base(executablePath, port, executableFileName)
         {
         }

dotnet/src/webdriver/DriverService.cs

@@ -50,14 +50,13 @@ public abstract class DriverService : ICommandServer
         /// <param name="servicePath">The full path to the directory containing the executable providing the service to drive the browser.</param>
         /// <param name="port">The port on which the driver executable should listen.</param>
         /// <param name="driverServiceExecutableName">The file name of the driver service executable.</param>
-        /// <param name="driverServiceDownloadUrl">This parameter is no longer used; kept for backwards compatibility.</param>
         /// <exception cref="ArgumentException">
         /// If the path specified is <see langword="null"/> or an empty string.
         /// </exception>
         /// <exception cref="DriverServiceNotFoundException">
         /// If the specified driver service executable does not exist in the specified directory.
         /// </exception>
-        protected DriverService(string servicePath, int port, string driverServiceExecutableName, Uri driverServiceDownloadUrl = null)
+        protected DriverService(string servicePath, int port, string driverServiceExecutableName)
         {
             this.driverServicePath = servicePath;
             this.driverServiceExecutableName = driverServiceExecutableName;