Removed redundant/unused IWebBrowser from MainWindow.Xaml.cs

MainWindow.xaml uses the MainView View/ViewModel, which contains its own IWebBrowser. Removed redundant/unused IWebBrowser from MainWindow.xaml.cs.

CefSharp.MinimalExample.Wpf/MainWindow.xaml.cs

@@ -5,22 +5,11 @@ using System.Windows;
 
 namespace CefSharp.MinimalExample.Wpf
 {
-    public partial class MainWindow : Window, INotifyPropertyChanged
+    public partial class MainWindow : Window
     {
-        private IWpfWebBrowser webBrowser;
-        public IWpfWebBrowser WebBrowser
-        {
-            get { return webBrowser; }
-            set { PropertyChanged.ChangeAndNotify(ref webBrowser, value, () => WebBrowser); }
-        }
-
         public MainWindow()
         {
             InitializeComponent();
-
-            DataContext = this;
         }
-
-        public event PropertyChangedEventHandler PropertyChanged;
     }
 }