update extension impl

src/DotNetCore.CAP.MySql/ICapTransaction.MySql.cs

@@ -7,7 +7,9 @@ namespace DotNetCore.CAP
 {
     public class MySqlCapTransaction : CapTransactionBase
     {
-        public MySqlCapTransaction(IDispatcher dispatcher) : base(dispatcher) { }
+        public MySqlCapTransaction(IDispatcher dispatcher) : base(dispatcher)
+        {
+        }
 
         public override void Commit()
         {
@@ -49,16 +51,6 @@ namespace DotNetCore.CAP
 
     public static class CapTransactionExtensions
     {
-        public static ICapTransaction Begin(this ICapTransaction transaction,
-            IDbTransaction dbTransaction, bool autoCommit = false)
-        {
-
-            transaction.DbTransaction = dbTransaction;
-            transaction.AutoCommit = autoCommit;
-
-            return transaction;
-        }
-
         public static ICapTransaction Begin(this ICapTransaction transaction,
             IDbContextTransaction dbTransaction, bool autoCommit = false)
         {
@@ -69,5 +61,4 @@ namespace DotNetCore.CAP
             return transaction;
         }
     }
-
-}
+}
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