cleanup

Author: SimonCropp

src/Polyfill/Polyfill_IEnumerable_MaxBy.cs

@@ -65,7 +65,7 @@ static partial class Polyfill
             }
             else
             {
-                ThrowHelper.ThrowNoElementsException();
+                ThrowNoElementsException();
             }
         }
 

src/Polyfill/Polyfill_IEnumerable_MinBy.cs

@@ -66,7 +66,7 @@ static partial class Polyfill
             }
             else
             {
-                ThrowHelper.ThrowNoElementsException();
+                ThrowNoElementsException();
             }
         }
 

src/Polyfill/Polyfill_IEnumerable_ThrowHelper.cs

@@ -5,9 +5,6 @@ namespace Polyfills;
 
 static partial class Polyfill
 {
-    private static class ThrowHelper
-    {
-        public static void ThrowNoElementsException() =>
-            throw new System.InvalidOperationException("Sequence contains no elements");
-    }
+    static void ThrowNoElementsException() =>
+        throw new System.InvalidOperationException("Sequence contains no elements");
 }