Remove redundant specification of type arguments

Change-Id: I49fa9e46dfabceec65d65f0b64e02d534c4be846

src/main/java/com/googlesource/gerrit/plugins/labelui/client/LabelPanel.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/labelui/client/LabelPanel.java b/src/main/java/com/googlesource/gerrit/plugins/labelui/client/LabelPanel.java
index 3890648..41c9d69 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/labelui/client/LabelPanel.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/labelui/client/LabelPanel.java
@@ -183,7 +183,7 @@
   }
 
   private static Set<String> getLabelNames(ChangeInfo change) {
-    return new TreeSet<String>(change.labels());
+    return new TreeSet<>(change.labels());
   }
 
   private static Map<String, AccountInfo> getUserMap(Set<String> labelNames,