HBASE-22763 Fixed remaining Checkstyle issue in hbase-procedure

Signed-off-by: stack <stack@apache.org>

Author: HorizonNet

hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/TimeoutExecutorThread.java

@@ -24,8 +24,6 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.ProcedureState;
-
 /**
  * Runs task on a period such as check for stuck workers.
  * @see InlineChore