Changing .NET ChromeOptions to use goog:chromeOptions as property name

This aligns with current chromedriver.exe expectations as well as with the
W3C WebDriver Specification. It also means that the .NET bindings will now
require 2.31 or later of chromedriver.exe.

Author: jimevans

dotnet/src/webdriver/Chrome/ChromeOptions.cs

@@ -1,4 +1,4 @@
-// <copyright file="ChromeOptions.cs" company="WebDriver Committers">
+// <copyright file="ChromeOptions.cs" company="WebDriver Committers">
 // Licensed to the Software Freedom Conservancy (SFC) under one
 // or more contributor license agreements. See the NOTICE file
 // distributed with this work for additional information
@@ -56,7 +56,7 @@ public class ChromeOptions : DriverOptions
         /// Gets the name of the capability used to store Chrome options in
         /// a <see cref="DesiredCapabilities"/> object.
         /// </summary>
-        public static readonly string Capability = "chromeOptions";
+        public static readonly string Capability = "goog:chromeOptions";
 
         private const string ArgumentsChromeOption = "args";
         private const string BinaryChromeOption = "binary";