Remove redundant type arguments

Change-Id: Idde43715a3b776867418ba9089d6caca5eb5ec8d

java/com/googlesource/gerrit/plugins/supermanifest/JiriManifestParser.java

diff --git a/java/com/googlesource/gerrit/plugins/supermanifest/JiriManifestParser.java b/java/com/googlesource/gerrit/plugins/supermanifest/JiriManifestParser.java
index 855ed26..538bc2b 100644
--- a/java/com/googlesource/gerrit/plugins/supermanifest/JiriManifestParser.java
+++ b/java/com/googlesource/gerrit/plugins/supermanifest/JiriManifestParser.java
@@ -93,7 +93,7 @@
         }
         HashSet<String> processedFiles = processedRepoFiles.get(mi.repoKey);
         if (processedFiles == null) {
-          processedFiles = new HashSet<String>();
+          processedFiles = new HashSet<>();
           processedRepoFiles.put(mi.repoKey, processedFiles);
         }
         if (processedFiles.contains(mi.manifest)) {