[dotnet] Annotate nullability on firefox and chromium options (#15206)

* [dotnet] Annotate nullability on firefox and chromium options

* Annotate some easy wins in the firefox namespace

Author: RenderMichael

Diff for: dotnet/src/webdriver/Chrome/ChromeOptions.cs

@@ -21,6 +21,8 @@
 using System;
 using System.Globalization;
 
+#nullable enable
+
 namespace OpenQA.Selenium.Chrome
 {
     /// <summary>
@@ -64,19 +66,13 @@ public ChromeOptions() : base()
         /// <summary>
         /// Gets the vendor prefix to apply to Chromium-specific capability names.
         /// </summary>
-        protected override string VendorPrefix
-        {
-            get { return "goog"; }
-        }
+        protected override string VendorPrefix => "goog";
 
         /// <summary>
         /// Gets the name of the capability used to store Chromium options in
         /// an <see cref="ICapabilities"/> object.
         /// </summary>
-        public override string CapabilityName
-        {
-            get { return string.Format(CultureInfo.InvariantCulture, "{0}:{1}", this.VendorPrefix, ChromeOptionsCapabilityName); }
-        }
+        public override string CapabilityName => string.Format(CultureInfo.InvariantCulture, "{0}:{1}", this.VendorPrefix, ChromeOptionsCapabilityName);
 
         /// <summary>
         /// Provides a means to add additional capabilities not yet added as type safe options
@@ -92,7 +88,7 @@ public override string CapabilityName
         /// where <paramref name="optionName"/> has already been added will overwrite the
         /// existing value with the new value in <paramref name="optionValue"/>.
         /// Calling this method adds capabilities to the Chrome-specific options object passed to
-        /// webdriver executable (property name 'goog:chromeOptions').</remarks>
+        /// WebDriver executable (property name 'goog:chromeOptions').</remarks>
         public void AddAdditionalChromeOption(string optionName, object optionValue)
         {
             this.AddAdditionalChromiumOption(optionName, optionValue);

Diff for: dotnet/src/webdriver/Edge/EdgeOptions.cs

@@ -21,6 +21,8 @@
 using System;
 using System.Globalization;
 
+#nullable enable
+
 namespace OpenQA.Selenium.Edge
 {
     /// <summary>
@@ -60,27 +62,21 @@ public EdgeOptions() : base()
         /// <summary>
         /// Gets the vendor prefix to apply to Chromium-specific capability names.
         /// </summary>
-        protected override string VendorPrefix
-        {
-            get { return "ms"; }
-        }
+        protected override string VendorPrefix => "ms";
 
         /// <summary>
         /// Gets the name of the capability used to store Chromium options in
         /// an <see cref="ICapabilities"/> object.
         /// </summary>
-        public override string CapabilityName
-        {
-            get { return string.Format(CultureInfo.InvariantCulture, "{0}:{1}", this.VendorPrefix, EdgeOptionsCapabilityName); }
-        }
+        public override string CapabilityName => string.Format(CultureInfo.InvariantCulture, "{0}:{1}", this.VendorPrefix, EdgeOptionsCapabilityName);
 
         /// <summary>
         /// Gets or sets whether to create a WebView session used for launching an Edge (Chromium) WebView-based app on desktop.
         /// </summary>
         public bool UseWebView
         {
-            get { return this.BrowserName == WebViewBrowserNameValue; }
-            set { this.BrowserName = value ? WebViewBrowserNameValue : DefaultBrowserNameValue; }
+            get => this.BrowserName == WebViewBrowserNameValue;
+            set => this.BrowserName = value ? WebViewBrowserNameValue : DefaultBrowserNameValue;
         }
 
         /// <summary>
@@ -97,7 +93,7 @@ public bool UseWebView
         /// where <paramref name="optionName"/> has already been added will overwrite the
         /// existing value with the new value in <paramref name="optionValue"/>.
         /// Calling this method adds capabilities to the Edge-specific options object passed to
-        /// webdriver executable (property name 'ms:edgeOptions').</remarks>
+        /// WebDriver executable (property name 'ms:edgeOptions').</remarks>
         public void AddAdditionalEdgeOption(string optionName, object optionValue)
         {
             this.AddAdditionalChromiumOption(optionName, optionValue);

Diff for: dotnet/src/webdriver/Firefox/FirefoxAndroidOptions.cs

@@ -18,17 +18,20 @@
 // </copyright>
 
 using OpenQA.Selenium.Internal;
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 
+#nullable enable
+
 namespace OpenQA.Selenium.Firefox
 {
     /// <summary>
     /// Generates the capabilities for automating Firefox applications on Android
     /// </summary>
     public class FirefoxAndroidOptions : AndroidOptions
     {
-        private List<string> androidIntentArguments = new List<string>();
+        private readonly List<string> androidIntentArguments = new List<string>();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="FirefoxAndroidOptions"/> class.
@@ -41,10 +44,7 @@ public FirefoxAndroidOptions(string androidPackage) : base(androidPackage)
         /// <summary>
         /// Gets a read-only list of the intent arguments set for this set of options.
         /// </summary>
-        public ReadOnlyCollection<string> AndroidIntentArguments
-        {
-            get { return this.androidIntentArguments.AsReadOnly(); }
-        }
+        public ReadOnlyCollection<string> AndroidIntentArguments => this.androidIntentArguments.AsReadOnly();
 
         /// <summary>
         /// Argument to launch the intent with. The given intent arguments are appended to the "am start" command.
@@ -59,6 +59,7 @@ public void AddIntentArgument(string argument)
         /// Arguments to launch the intent with. The given intent arguments are appended to the "am start" command.
         /// </summary>
         /// <param name="arguments">The arguments to add.</param>
+        /// <exception cref="ArgumentNullException">If <paramref name="arguments"/> is <see langword="null"/>.</exception>
         public void AddIntentArguments(params string[] arguments)
         {
             this.androidIntentArguments.AddRange(arguments);

Diff for: dotnet/src/webdriver/Firefox/FirefoxCommandContext.cs

@@ -17,6 +17,8 @@
 // under the License.
 // </copyright>
 
+#nullable enable
+
 namespace OpenQA.Selenium.Firefox
 {
     /// <summary>

Diff for: dotnet/src/webdriver/Firefox/FirefoxDriverLogLevel.cs

@@ -17,6 +17,8 @@
 // under the License.
 // </copyright>
 
+#nullable enable
+
 namespace OpenQA.Selenium.Firefox
 {
     /// <summary>