remove PerCallPolicy and Apply method

sdk/core/Azure.Core/src/HttpMessage.cs

@@ -123,23 +123,6 @@ public void SetProperty(string name, object value)
             }
         }
 
-        /// <summary>
-        /// Applies options from <see cref="RequestContext"/> instance to a <see cref="HttpMessage"/>.
-        /// </summary>
-        /// <param name="RequestContext"></param>
-        public void Apply(RequestContext RequestContext)
-        {
-            if (RequestContext == null)
-            {
-                return;
-            }
-
-            if (RequestContext.PerCallPolicy != null)
-            {
-                SetProperty("RequestContextPerCallPolicyCallback", RequestContext.PerCallPolicy);
-            }
-        }
-
         /// <summary>
         /// Disposes the request and response.
         /// </summary>

sdk/core/Azure.Core/src/RequestContext.cs

@@ -35,23 +35,5 @@ public RequestContext()
         /// Controls under what conditions the operation raises an exception if the underlying response indicates a failure.
         /// </summary>
         public ErrorOptions ErrorOptions { get; set; } = ErrorOptions.Default;
-
-        /// <summary>
-        /// A <see cref="HttpPipelinePolicy"/> to use as part of this operation. This policy will be applied at the start
-        /// of the underlying <see cref="HttpPipeline"/>.
-        /// </summary>
-        internal HttpPipelinePolicy? PerCallPolicy { get; set; }
-
-        /// <summary>
-        /// An <see cref="HttpPipelineSynchronousPolicy"/> which invokes an action when a request is being sent.
-        /// </summary>
-        internal class ActionPolicy : HttpPipelineSynchronousPolicy
-        {
-            private Action<HttpMessage> Action { get; }
-
-            public ActionPolicy(Action<HttpMessage> action) => Action = action;
-
-            public override void OnSendingRequest(HttpMessage message) => Action.Invoke(message);
-        }
     }
 }