WinForms - OnHandleDestroyed directly references CefSharp.Core crashing Designer

Designer attempts to load CefSharp.Core.dll which in fails, we avoid that when designMode is true

Resolves #3219

Author: amaitland

CefSharp.WinForms/ChromiumWebBrowser.cs

@@ -672,6 +672,18 @@ protected override void OnHandleCreated(EventArgs e)
         }
 
         protected override void OnHandleDestroyed(EventArgs e)
+        {
+            if (!designMode)
+            {
+                // NOTE: Had to move the code out of this function otherwise the designer would crash
+                OnHandleDestroyedInternal();
+            }
+
+            base.OnHandleDestroyed(e);
+        }
+
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private void OnHandleDestroyedInternal()
         {
             //When the Control is being Recreated then we'll park
             //the browser (set to a temp parent) and assign to
@@ -686,8 +698,6 @@ protected override void OnHandleDestroyed(EventArgs e)
 
                 NativeMethodWrapper.SetWindowParent(hwnd, parkingControl.Handle);
             }
-
-            base.OnHandleDestroyed(e);
         }
 
         /// <summary>