Fix that RemoveUser Doesn't Work When Create Public Client with Broker (#441)

* Fix that RemoveUser doesn't work when create public client with broker set

* Address review comments

Author: msJinLei

src/Authentication.Abstractions/Interfaces/IAuthenticationFactory.cs

@@ -133,6 +133,15 @@ IAccessToken Authenticate(
         /// </summary>
         /// <param name="account">The account to remove credentials for</param>
         /// <param name="tokenCache">The TokenCache to remove credentials from</param>
+        [Obsolete("RemoveUser is deprecated, please use RemoveUser with Azure environment instead.", true)]
         void RemoveUser(IAzureAccount account, IAzureTokenCache tokenCache);
+
+
+        /// <summary>
+        /// Remove any stored credentials for the given user and the Azure environment used.
+        /// </summary>
+        /// <param name="account">The account to remove credentials for</param>
+        /// <param name="environment">The environment which account belongs to</param>
+        void RemoveUser(IAzureAccount account, IAzureEnvironment environment);
     }
 }