Fix typo. It has been there for 4 years.

	Why on earth this wasn't found earlier? $20 reward to whoever gives a
	plausible explanation.

mcs/class/System/System.Net/WebRequest.cs

@@ -286,7 +286,7 @@ namespace System.Net
 		{
 			if (requestUri == null)
 				throw new ArgumentNullException ("requestUri");
-			return GetCreator (requestUri.AbsoluteUri).Create (requestUri);
+			return GetCreator (requestUri.Scheme).Create (requestUri);
 		}
 		
 		public static WebRequest CreateDefault (Uri requestUri)