AuditEvent: Change params to ListMultimap to adapt to API changes

This was changed in I5f1d15e27 in core.

Change-Id: I87a37e0cfcde8c9bf14b1385c6745da94fd154e7
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeleteLog.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeleteLog.java
index 8eca1d3..3644e93 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeleteLog.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeleteLog.java
@@ -14,8 +14,8 @@
 
 package com.googlesource.gerrit.plugins.deleteproject;
 
-import com.google.common.collect.HashMultimap;
-import com.google.common.collect.Multimap;
+import com.google.common.collect.ListMultimap;
+import com.google.common.collect.MultimapBuilder;
 import com.google.gerrit.audit.AuditEvent;
 import com.google.gerrit.audit.AuditService;
 import com.google.gerrit.common.TimeUtil;
@@ -94,7 +94,8 @@
 
   private void audit(IdentifiedUser user, long ts, Project.NameKey project,
       DeleteProject.Input options, Exception ex) {
-    Multimap<String, Object> params = HashMultimap.create();
+    ListMultimap<String, Object> params =
+        MultimapBuilder.hashKeys().arrayListValues().build();
     params.put("class", DeleteLog.class);
     params.put("project", project.get());
     if (options != null) {