WinForms/WPF/OffScreen - Set disable-chrome-login-prompt command line arg by default

- GetAuthCredentials won't be called otherwise, those wishing to use the Chrome password
  prompt can remove the command line arg at runtime.

Resolves #4830

Author: amaitland

CefSharp.OffScreen/CefSettings.cs

@@ -21,6 +21,11 @@ public CefSettings() : base()
             //For OffScreen it doesn't make much sense to enable audio by default, so we disable it.
             //this can be removed in user code if required
             CefCommandLineArgs.Add("mute-audio");
+
+            // CEF doesn't call GetAuthCredentials unless
+            // the Chrome login prompt is disabled
+            // https://github.com/chromiumembedded/cef/issues/3603 
+            CefCommandLineArgs.Add("disable-chrome-login-prompt");
         }
 
         /// <summary>

CefSharp.WinForms/CefSettings.cs

@@ -16,6 +16,11 @@ public class CefSettings : CefSettingsBase
         public CefSettings() : base()
         {
             ChromeRuntime = true;
+
+            // CEF doesn't call GetAuthCredentials unless
+            // the Chrome login prompt is disabled
+            // https://github.com/chromiumembedded/cef/issues/3603 
+            CefCommandLineArgs.Add("disable-chrome-login-prompt");
         }
     }
 }

CefSharp.Wpf/CefSettings.cs

@@ -22,6 +22,11 @@ public CefSettings() : base()
             //With OSR rendering it's fairly common for this to improve scrolling performace
             //https://peter.sh/experiments/chromium-command-line-switches/#disable-threaded-scrolling
             //CefCommandLineArgs.Add("disable-threaded-scrolling");
+
+            // CEF doesn't call GetAuthCredentials unless
+            // the Chrome login prompt is disabled
+            // https://github.com/chromiumembedded/cef/issues/3603 
+            CefCommandLineArgs.Add("disable-chrome-login-prompt");
         }
     }
 }