Removed findActiveActivityIds from ProcessInstance interface (should use ...

Removed findActiveActivityIds from ProcessInstance interface (should use  runtimeService.getActiveActivityIds())

modules/activiti-engine/src/main/java/org/activiti/engine/runtime/ProcessInstance.java

@@ -12,8 +12,6 @@
  */
 package org.activiti.engine.runtime;
 
-import java.util.List;
-
 import org.activiti.engine.repository.ProcessDefinition;
 
 
@@ -30,9 +28,4 @@ public interface ProcessInstance extends Execution {
    */
   String getProcessDefinitionId();
   
-  /**
-   * The ids of the activities that currently are active.
-   */
-  List<String> findActiveActivityIds();
-  
 }