[dotnet] remove deprecated methods that have no effect

Author: titusfortner

dotnet/src/webdriver/Firefox/FirefoxOptions.cs

@@ -92,16 +92,6 @@ public FirefoxOptions()
             this.AddKnownCapabilityName(FirefoxOptions.FirefoxEnableDevToolsProtocolCapability, "EnableDevToolsProtocol property");
         }
 
-        /// <summary>
-        /// Gets or sets a value indicating whether to use the legacy driver implementation.
-        /// </summary>
-        [Obsolete(".NET bindings no longer support the legacy driver implementation. Setting this property no longer has any effect. .NET users should always be using geckodriver.")]
-        public bool UseLegacyImplementation
-        {
-            get { return false; }
-            set { }
-        }
-
         /// <summary>
         /// Gets or sets the <see cref="FirefoxProfile"/> object to be used with this instance.
         /// </summary>

dotnet/src/webdriver/Remote/SendingRemoteHttpRequestEventArgs.cs

@@ -45,15 +45,6 @@ public SendingRemoteHttpRequestEventArgs(string method, string fullUrl, string r
             this.requestBody = requestBody;
         }
 
-        /// <summary>
-        /// Gets the <see cref="HttpWebRequest"/> object representing the HTTP request being sent.
-        /// </summary>
-        [Obsolete("Bindings no longer use HttpWebRequest. This property will return null, and will be removed in a future release.")]
-        public HttpWebRequest Request
-        {
-            get { return null; }
-        }
-
         /// <summary>
         /// Gets the HTTP method for the HTTP request.
         /// </summary>