Merge pull request #196 from fuyou001/ROCKETMQ-314-1

[ROCKETMQ-314] msg send back must sync change process queue msg size

client/src/main/java/org/apache/rocketmq/client/impl/consumer/ProcessQueue.java

@@ -17,6 +17,7 @@
 package org.apache.rocketmq.client.impl.consumer;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
@@ -102,7 +103,7 @@ public class ProcessQueue {
                     try {
                         if (!msgTreeMap.isEmpty() && msg.getQueueOffset() == msgTreeMap.firstKey()) {
                             try {
-                                msgTreeMap.remove(msgTreeMap.firstKey());
+                                removeMessage(Collections.singletonList(msg));
                             } catch (Exception e) {
                                 log.error("send expired msg exception", e);
                             }