Remove unused import

Change-Id: I4efd12789b79a418934f58b7036eb73f3a44aec2
diff --git a/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteBatchRefUpdateTest.java b/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteBatchRefUpdateTest.java
index 46eb424..fcbafbb 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteBatchRefUpdateTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteBatchRefUpdateTest.java
@@ -14,7 +14,6 @@
 
 package com.googlesource.gerrit.plugins.multisite.validation;
 
-import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 import static java.util.Arrays.asList;
 import static org.mockito.ArgumentMatchers.argThat;
 import static org.mockito.ArgumentMatchers.eq;